Book: Earnest, Russell D. & Earnest, Corinne P. 1997 Papers for Birth Dayes: Guide to the Fraktur Artists and Scriveners. 2 vols. 909.
• For more info. on Portzline, see pp. 623-626. This example not listed.Article: Hubbert, Ruthann. 1982 "Francis Portzline (1771-1857)". The Snyder County Historical Society Bulletin. 19-29.