Book: Hutchins, Catherine E., et al. 1983 Arts of the Pennsylvania Germans.
• Published as fig. 229, p. 239.Book: Earnest, Russell D. & Earnest, Corinne P. 1997 Papers for Birth Dayes: Guide to the Fraktur Artists and Scriveners. 2 vols. 909.
• Published on p. 546.Article: Weiser, Frederick S. 1987 Christian Mertel, the "C M artist". Der Reggeboge: Journal of the Pennsylvania German Society. 21 (2): 75-85.
• For more info. on this artist, see pp. 75-85.