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jstor.org
Banning, E.B. (1998). «The Neolithic Period: Triumphs of Architecture, Agriculture, and Art». Near Eastern Archaeology. 61 (4): 188–237. JSTOR3210656. doi:10.2307/3210656
Heizer, Robert F. (1951). «The Sickle in Aboriginal Western North America». American Antiquity. 16 (3): 247–252. JSTOR276785. doi:10.2307/276785
Works, Martha A. (1987). «Aguaruna Agriculture in Eastern Peru». Geographical Review. 77 (3): 343–358. JSTOR214125. doi:10.2307/214125