Ivan Ghezzi e Clive Ruggles; Chankillo: A 2300-Year-Old Solar Observatory in Coastal Peru (em inglês) in Science Vol. 315 02 Mar 2007, pp. 1239-1243 ISSN0036-8075. OCLC110607624
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Ivan Ghezzi e Clive Ruggles; Chankillo: A 2300-Year-Old Solar Observatory in Coastal Peru (em inglês) in Science Vol. 315 02 Mar 2007, pp. 1239-1243 ISSN0036-8075. OCLC110607624