Deuchler, Florens, Jeffrey M. Hoffeld, and Helmut Nickel.
The Cloisters Apocalypse: An Early Fourteenth-Century Manuscript in Facsimile. New York: The Metropolitan Museum of Art, 1971.
Nickel, Helmut. "'A Harnes all Gilte': A Study of the Armor of Galiot de Genouilhac and the Iconography of Its Decoration."
Metropolitan Museum Journal, Vol. 5 (1972). New York: The Metropolitan Museum of Art, 1972.
Nickel, Helmut. "A Crusader's Sword: Concerning the Effigy of Jean d'Alluye."
Metropolitan Museum Journal, Vol. 26 (1991). New York: The Metropolitan Museum of Art, 1991.
Nickel, Helmut. "A Heraldic Note About the Portrait of Ladislaus, Count of Haag, by Hans Mielich."
Metropolitan Museum Journal, Vol. 22 (1987). New York: The Metropolitan Museum of Art, 1987.
Nickel, Helmut. "A Knightly Sword with Presentation Inscriptions."
Metropolitan Museum Journal, Vol. 2 (1969). New York: The Metropolitan Museum of Art, 1969.
Nickel, Helmut. "A Note on the Iconography of the Sangemini Doorway."
Metropolitan Museum Journal, Vol. 35 (2000). New York: The Metropolitan Museum of Art, 2000.
Nickel, Helmut. "A Theory about the Early History of the Cloisters Apocalypse."
Metropolitan Museum Journal, Vol. 6 (1972). New York: The Metropolitan Museum of Art, 1972.
Nickel, Helmut. "About the Sequence of the Tapestries in The Hunt of the Unicorn and The Lady with the Unicorn."
Metropolitan Museum Journal, Vol. 17 (1982). New York: The Metropolitan Museum of Art, 1982.
Nickel, Helmut. "About the Sword of the Huns and the 'Urepos' of the Steppes."
Metropolitan Museum Journal, Vol. 7 (1973). New York: The Metropolitan Museum of Art, 1973.
Nickel, Helmut. "Addenda to 'Ceremonial Arrowheads from Bohemia'."
Metropolitan Museum Journal, Vol. 4 (1971). New York: The Metropolitan Museum of Art, 1971.
Nickel, Helmut. "An Illustrated Manuscript Inventory of an Armory for Sale by Lottery." Metropolitan Museum Journal, Vol. 41 (2006). New York: The Metropolitan Museum of Art, 2006.
Nickel, Helmut. "And Behold a White Horse...Observations on the Colors of the Four Horsemen of the Apocalypse."
Metropolitan Museum Journal, Vol. 12 (1977). New York: The Metropolitan Museum of Art, 1977.
Nickel, Helmut. "Arms and Armor: From the Permanent Collection."
Metropolitan Museum of Art Bulletin, v. 49, no. 1 (Summer, 1991). New York: The Metropolitan Museum of Art, 1991.
Nickel, Helmut. "Arms and Armor."
Metropolitan Museum of Art Bulletin, v. 32, no. 4 (1974). New York: The Metropolitan Museum of Art, 1974.
Nickel, Helmut. "Carpaccio's Young Knight in a Landscape: Christian Champion and Guardian of Liberty."
Metropolitan Museum Journal, Vol. 18 (1983). New York: The Metropolitan Museum of Art, 1983.
Nickel, Helmut. "Ceremonial Arrowheads from Bohemia."
Metropolitan Museum Journal, Vol. 1 (1968). New York: The Metropolitan Museum of Art, 1968.
Nickel, Helmut.
In the Presence of Kings: Royal Treasures from the Collections of The Metropolitan Museum of Art. New York: The Metropolitan Museum of Art, 1967.
Nickel, Helmut. "Luisa Boncompagni Ludovisi Ottoboni dei Duchi di Fiano, Later Countess Francesco Papafava dei Carraresi, and Her Portrait by Ingres."
Metropolitan Museum Journal, Vol. 4 (1971). New York: The Metropolitan Museum of Art, 1971.
Nickel, Helmut. "Miss America's Brother and His Club."
Metropolitan Museum Journal, Vol. 37 (2002). New York: The Metropolitan Museum of Art, 2002.
Nickel, Helmut. "Of Dragons, Basilisks, and the Arms of the Seven Kings of Rome."
Metropolitan Museum Journal, Vol. 24 (1989). New York: The Metropolitan Museum of Art, 1989.
Nickel, Helmut. "Presents to Princes: A Bestiary of Strange and Wondrous Beasts, Once Known, for a Time Forgotten, and Rediscovered."
Metropolitan Museum Journal, Vol. 26 (1991). New York: The Metropolitan Museum of Art, 1991.
Nickel, Helmut. "Sir Gawayne and the Three White Knights."
Metropolitan Museum of Art Bulletin, v. 28, no. 4 (December, 1969). New York: The Metropolitan Museum of Art, 1969.
Nickel, Helmut. "Some Heraldic Fragments Found at Castle Montfort/Starkenberg in 1926, and the Arms of the Grand Master of the Teutonic Knights."
Metropolitan Museum Journal, Vol. 24 (1989). New York: The Metropolitan Museum of Art, 1989.
Nickel, Helmut. "Some Remarks on the Armorial Tapestry of John Dynham at The Cloisters."
Metropolitan Museum Journal, Vols. 19–20 (1984–85). New York: The Metropolitan Museum of Art, 1984.
Nickel, Helmut. "Tamgas and Runes, Magic Numbers and Magic Symbols."
Metropolitan Museum Journal, Vol. 8 (1973). New York: The Metropolitan Museum of Art, 1973.
Nickel, Helmut. "The Armorers' Shop."
Metropolitan Museum of Art Bulletin, v. 28, no. 4 (December, 1969). New York: The Metropolitan Museum of Art, 1969.
Nickel, Helmut. "The Battle of the Crescent."
Metropolitan Museum of Art Bulletin, v. 24, no. 3 (November, 1965). New York: The Metropolitan Museum of Art, 1965.
Nickel, Helmut. "The Bride and the Cat: A Possible Source for Overbeck's
Freundschaftsbild of Franz Pforr."
Metropolitan Museum Journal, Vol. 27 (1992). New York: The Metropolitan Museum of Art, 1992.
Nickel, Helmut. "The Dragon and the Pearl."
Metropolitan Museum Journal, Vol. 26 (1991). New York: The Metropolitan Museum of Art, 1991.
Nickel, Helmut. "The Emperor's New Saddle Cloth: The Ephippium of the Equestrian Statue of Marcus Aurelius."
Metropolitan Museum Journal, Vol. 24 (1989). New York: The Metropolitan Museum of Art, 1989.
Nickel, Helmut. "The Graphic Sources for the Moor with the Emerald Cluster."
Metropolitan Museum Journal, Vol. 15 (1980). New York: The Metropolitan Museum of Art, 1980.
Nickel, Helmut. "The Great Pendant with the Arms of Saxony."
Metropolitan Museum Journal, Vol. 15 (1980). New York: The Metropolitan Museum of Art, 1980.
Nickel, Helmut. "The Iron Door Mountings from St.-Leonard-de-Noblat."
Metropolitan Museum Journal, Vol. 23 (1988). New York: The Metropolitan Museum of Art, 1988.
Nickel, Helmut. "The Judgment of Paris by Lucas Cranach the Elder: Nature, Allegory, and Alchemy."
Metropolitan Museum Journal, Vol. 16 (1981). New York: The Metropolitan Museum of Art, 1981.
Nickel, Helmut. "The Little Knights of the Living-Room Table."
Metropolitan Museum of Art Bulletin, v. 25, no. 4 (December, 1966). New York: The Metropolitan Museum of Art, 1966.
Nickel, Helmut. "The Man beside the Gate."
Metropolitan Museum of Art Bulletin, v. 24, no. 8 (April, 1966). New York: The Metropolitan Museum of Art, 1966.
Nickel, Helmut. "The Seven Shields of Behaim: New Evidence."
Metropolitan Museum Journal, Vol. 30 (1995). New York: The Metropolitan Museum of Art, 1995.
Nickel, Helmut. "The Sun, the Moon, and an Eclipse: Observations on The Crucifixion with the Virgin and Saint John, by Hendrick Ter Brugghen." Metropolitan Museum Journal, Vol. 42 (2007). New York: The Metropolitan Museum of Art, 2007.
Nickel, Helmut. "Things for Kings."
Metropolitan Museum of Art Bulletin, v. 26, no. 1 (Summer, 1967). New York: The Metropolitan Museum of Art, 1967.
Nickel, Helmut. "Two Falcon Devices of the Strozzi: An Attempt at Interpretation."
Metropolitan Museum Journal, Vol. 9 (1974). New York: The Metropolitan Museum of Art, 1974.