J. Pierpont Morgan, London and New York (until 1917)
New York. The Cloisters Museum & Gardens. "The Secular Spirit: Life and Art at the End of the Middle Ages," March 28, 1975–June 15, 1975.
New York. The Cloisters Museum & Gardens, The Metropolitan Museum of Art. "Treasures and Talismans: Rings from the Griffin Collection," May 1–October 18, 2015.
Williamson, George Charles. Catalogue of the Collections of Jewels and Precious Works of Art: The Property of J. Pierpont Morgan. Deluxe ed. London: Chiswick Press, 1910. no. 79, pp. 121–22, pl. LIX.
Müller, Theodor. Ingolstadt. Grosse Kunstführer, Vol. 24. Munich: Schnell & Steiner, 1958. p. 19, fig. 11.
Husband, Timothy B., and Jane Hayward, ed. The Secular Spirit: Life and Art at the End of the Middle Ages. New York: The Metropolitan Museum of Art, 1975. no. 159, pp. 139-140.
Husband, Timothy B. The Wild Man: Medieval Myth and Symbolism. New York: The Metropolitan Museum of Art, 1980. p. 180, fig. 122.
Norris, Michael. Medieval Art: A Resource for Educators. New York: The Metropolitan Museum of Art, 2005. pp. 24-25, fig. 18.