Fred Brenckman, Official Commonwealth Historian. HISTORY OF CARBON COUNTY PENNSYLVANIA. 2nd (1913) archive.org,. Also Containing a Separate Account of the Several Boroughs and Townships in the County, J. Nungesser, Harrisburg, PA, project 1913 edition, pdf e-reprint), 1884, p. 627.
atlantic-cable.com
Donald Sayenga. «Modern History of Wire Rope». History of the Atlantic Cable & Submarine Telegraphy (atlantic-cable.com). Arxivat de l'original el 3 febrer 2014. [Consulta: 9 abril 2014].
Donald Sayenga. «Modern History of Wire Rope». History of the Atlantic Cable & Submarine Telegraphy (atlantic-cable.com). Arxivat de l'original el 3 febrer 2014. [Consulta: 9 abril 2014].