«APS Member History». search.amphilsoc.org. Consultado el 14 de diciembre de 2020.
bradford-pa.com
Bradford County HistoryArchivado el 27 de julio de 2011 en Wayback Machine., Bradford County, Pennsylvania. Accessed August 21, 2007. "Founded in 1810, it was originally called Ontario, but the name was changed to Bradford in honor of U.S. Attorney General William Bradford, a member of George Washington's cabinet."
Bradford County HistoryArchivado el 27 de julio de 2011 en Wayback Machine., Bradford County, Pennsylvania. Accessed August 21, 2007. "Founded in 1810, it was originally called Ontario, but the name was changed to Bradford in honor of U.S. Attorney General William Bradford, a member of George Washington's cabinet."