H. C. Marillier. "Christie's" 1766 to 1925. London, 1926, p. 225.
Paul Ganz. Die Handzeichnungen Hans Holbeins d.J.: Kritischer Katalog. Berlin, 1937, p. 21, under no. 93, erroneously as in the Duveen collection; identifies the sitters in this and MMA 50.69.2 as William Roper and Margaret More.
Paul Ganz. Letter. March 31, 1948, as "very good quality" works by Holbein.
Paul Ganz. The Paintings of Hans Holbein. London, 1950, p. 258, no. 134, pl. 175, erroneously as in the collection of Mrs. Henry Goldman.
F. Grossmann. "Holbein Studies—II." Burlington Magazine 93 (April 1951), p. 114.
Josephine L. Allen. "Some Notes on Miniatures." Metropolitan Museum of Art Bulletin 13 (April 1955), pp. 244–45, ill.
E. E. Reynolds. Margaret Roper, Eldest Daughter of St. Thomas More. New York, 1960, pp. 30, 142, pl. VI.
Leo R. Schidlof. The Miniature in Europe in the 16th, 17th, 18, and 19th Centuries. Graz, Austria, 1964, vol. 1, p. 368; vol. 2, p. 975; vol. 3, pl. 290, fig. 569.
Roy Strong. Tudor & Jacobean Portraits. London, 1969, vol. 1, p. 269, states that the portraits are by Holbein but that the identities of the sitters "remain unproven".
J. B. Trapp and Hubertus Schulte Herbrüggen. "The King's Good Servant": Sir Thomas More, 1477/8–1535. Exh. cat., National Portrait Gallery. London, 1977, pp. 87, 89, no. 174 (with MMA 50.69.2), ill.
Jane Roberts. Holbein. London, 1979, p. 96, no. 93, ill. p. 97, believes it impossible to date the pair of miniatures precisely, and notes that they are "tentatively attributed to Holbein by most scholars, but the hand seems slightly different to that seen in the artist's other miniatures".
Daphne Foskett. Collecting Miniatures. Woodbridge, England, 1979, p. 47, as recently added to the list of "possibly authentic" miniatures by Holbein.
Howard Hibbard. The Metropolitan Museum of Art. New York, 1980, pp. 263, 266, fig. 476 (color, with 50.69.2).
Roy Strong in The English Miniature. Exh. cat., Yale Center for British Art, Yale University. New Haven, 1981, p. 36, fig. 51.
Roy Strong in Artists of the Tudor Court: The Portrait Miniature Rediscovered, 1520–1620. Exh. cat., Victoria and Albert Museum. London, 1983, pp. 46–47, no. 27.
Roy Strong. The English Renaissance Miniature. New York, 1983, pp. 46–47, no. 5, fig. 42.
John Rowlands. Holbein: The Paintings of Hans Holbein the Younger. Oxford, 1985, pp. 90, 150, no. M. 4, pl. 129, dates the miniatures probably 1536 on the basis of the inscription on the portrait of Margaret.
Graham Reynolds. English Portrait Miniatures. rev. ed. [1st ed., 1952]. Cambridge, 1988, pp. 6–7, fig. 2.
Graham Reynolds with the assistance of Katharine Baetjer. European Miniatures in The Metropolitan Museum of Art. Exh. cat., The Metropolitan Museum of Art. New York, 1996, pp. 12, 14, 69–70, no. 4, colorpl. 4 and ill. p. 69.
Katharine Baetjer. "British Portraits in The Metropolitan Museum of Art." Metropolitan Museum of Art Bulletin 57 (Summer 1999), pp. 6–7, ill. (color).
Susan Foister in Gothic: Art for England, 1400–1547. Ed. Richard Marks and Paul Williamson. Exh. cat., Victoria and Albert Museum. London, 2003, p. 299, no. 163a, ill. (color).
Susan Foister. Holbein and England. New Haven, 2004, p. 98.
Susan Foister. Holbein in England. Exh. cat., Tate Britain. London, 2006, pp. 41, 46, 175, no. 37, ill. (color).