Book: Hutchins, Catherine E., et al. 1983 Arts of the Pennsylvania Germans.
• Published as fig. 249, p. 256.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. 311.Article: Weiser, Frederick S. 1982 "His Deeds Followed Him: The Fraktur of John Conrad Gilbert". Der Reggeboge: Journal of the Pennsylvania German Society. 16 (2)
• More info. on the artist.