Book: Stopp, Klaus. 1998 The Printed Birth and Baptismal Certificates of the German Americans. 3.
• See Stopp 363.3, p. 48 (Winterthu's example not listed).Article: Rosenberry, Edward L. 1988 "G.S. Peters and his Joseph's Book of Many Colors". Der Reggeboge: Journal of the Pennsylvania German Society. 22 (1): 1-14.
Article: Egle, William G. 1883 "Gustav Sigismund Peters". Der Deutsche Pioneer. 8: 307-311.