Frazer, Margaret English. "Medieval Church Treasures." The Metropolitan Museum of Art Bulletin, n.s., 43, no. 3 (Winter 1985-1986). p. 10, fig. 3.
McLachlan Elizabeth Parker. "Liturgical Vessels and Implements." In The Liturgy of the Medieval Church, edited by Thomas J. Heffernan, and E. Ann Matter. Consortium for the Teaching of the Middle Ages. Kalamazoo, Michigan: Western Michigan University, 2005. p. 392,394., fig. 4.