Source Information
Ancestry.com. Upon this rock : the saga of Peter Gfeller, patriarch, pedagogue, pioneer, from the land of Pestalozzi, 1853-1953 [database on-line]. Provo, UT: Ancestry.com Operations Inc, 2005.Original data: Read, Gladwin A.. "Upon this rock" : the saga of Peter Gfeller, patriarch, pedagogue, pioneer, from the land of Pestalozzi, 1853-1953. Evanston, Ill.: unknown, 1953?.