Ovechkina, M.N. 2007. Calcareous nannoplankton of the Upper Cretaceous (Campanian and Maastrichtian) of the southern and eastern Russian Platform. Nauka, Moscow. 353 pp. ISBN978-5-02-035758-7[1]
M. Palacios-Fest & Owen K. Davis (2008). "8"(PDF). Las Capas: Early Irrigation and Sedentism in a Southwestern Floodplain. Anthropological Papers No. 28, ed. Jonathan B. Mabry (Center for Desert Archaeology, Tucson, Arizona, USA). pp. 197–220. Arquivado dende o orixinal(PDF) o 17 de xullo de 2011. Consultado o 15 de abril de 2020.
M. Palacios-Fest & Owen K. Davis (2008). "8"(PDF). Las Capas: Early Irrigation and Sedentism in a Southwestern Floodplain. Anthropological Papers No. 28, ed. Jonathan B. Mabry (Center for Desert Archaeology, Tucson, Arizona, USA). pp. 197–220. Arquivado dende o orixinal(PDF) o 17 de xullo de 2011. Consultado o 15 de abril de 2020.