Taylor RE (1985). "The beginnings of radiocarbon dating in American Antiquity: a historical perspective". American Antiquity: Journal of the Society for American Archaeology. 50 (2): 309–325. doi:10.2307/280489.
North American Commission on Stratigraphic Nomenclature (November 2005). "North American Stratigraphic Code". The American Association of Petroleum Geologists Bulletin (ed. Article 13 (c)). 89 (11): 1547–1591. doi:10.1306/07050504129.
North American Commission on Stratigraphic Nomenclature (November 2005). "North American Stratigraphic Code". The American Association of Petroleum Geologists Bulletin (ed. Article 13 (c)). 89 (11): 1547–1591. doi:10.1306/07050504129.
Greene, Kevin (2002). Archaeology: An Introduction. Philadelphia: University of Pennsylvania Press. m/s. 165–167. ISBN0-8122-1828-0. Cite has empty unknown parameter: |coauthors= (bantuan)