ウィリアムズポート (ペンシルベニア州)
↑ American FactFinder. U.S. Census Bureau.
1 2 Williamsport - History. City of Williamsport.
1 2 Hunsinger, Lou Jr. From Indentured Servitude to City Founder. Williamsport Sun-Gazette.
↑ Hunsinger, Lou Jr. William Hepburn: Father of Lycoming County. Williamsport Sun-Gazette.
↑ Meginness, John Franklin. History of Lycoming County. 1st Ed. Ch.XVI: First Jail and Courthouse. pp.262-272. Chicago: Brown, Runk & Co. 1892年. ISBN 0-7884-0428-8.
↑ Table 10. Population of the 100 Largest Urban Places: 1870. U.S. Bureau of the Census. 1998年6月15日.
1 2 3 4 Meginness, Ch.XXI: Williamsport (Continued). pp.338-379.
↑ Hunsinger, Lou Jr. James H. Perkins: Father of the Susquehanna Boom. Williamsport Sun-Gazette.