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nytimes.com
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Necrológica en el New York Times: "Richard Hartshorne; Geographer Was 92", 10 de noviembre de 1992, Eprint
web.archive.org
McMaster, Robert and McMaster, Susanna, "A History of Twentieth-Century American Academic Cartography" in Cartography and Geographic Information Science, v.29, n. 3, July, 2002, American Congress on Surveying and Mapping, Gaithersburg, MD. U of Wisconsin PDF EprintArchivado el 20 de octubre de 2006 en Wayback Machine.
wisc.edu
geography.wisc.edu
McMaster, Robert and McMaster, Susanna, "A History of Twentieth-Century American Academic Cartography" in Cartography and Geographic Information Science, v.29, n. 3, July, 2002, American Congress on Surveying and Mapping, Gaithersburg, MD. U of Wisconsin PDF EprintArchivado el 20 de octubre de 2006 en Wayback Machine.