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Ashmore, Wendy; Sharer, Robert (2013). Discovering our past : a brief introduction to archaeology (6th ed.). New York: McGraw-Hill. ISBN978-0-07-803491-6. OCLC821067667.
Sharer, Robert J. (2003). Archaeology: Discovering our past (3rd ed.). Boston: McGraw-Hill Higher Education. pp. 61–63. ISBN0-7674-2727-0. OCLC50802481.
Ashmore, Wendy (4 March 2013). Discovering our past : a brief introduction to archaeology. Sharer, Robert J. (Sixth ed.). New York. ISBN978-0-07-803491-6. OCLC821067667.{{cite book}}: CS1 maint: location missing publisher (link)