Sweinhart, F. C. (1941). "Early Pennsylvania Clocks and Their MakersArquivado 22 de febreiro de 2019 en Wayback Machine.". En The Bulletin of the Historical Society of Montgomery County. Historical Society of Montgomery County. Volume 3. Nº 1. Páxina 43. ISSN 0362-8590
Sweinhart, F. C. (1941). "Early Pennsylvania Clocks and Their MakersArquivado 22 de febreiro de 2019 en Wayback Machine.". En The Bulletin of the Historical Society of Montgomery County. Historical Society of Montgomery County. Volume 3. Nº 1. Páxina 43. ISSN 0362-8590
Benjamin Franklin, no seu testamento, deixoulle a Rittenhouse un telescopio a cambio do uso do observatorio de Rittenhouse. Véxase o testamento de Franklin en WikiSource.