Dillehay TD, Eling HH Jr, Rossen J (2005). „Preceramic irrigation canals in the Peruvian Andes”. Proceedings of the National Academy of Sciences102 (47), 17241–4. o. DOI:10.1073/pnas.0508583102. PMID16284247.
Dillehay TD, Eling HH Jr, Rossen J (2005). „Preceramic irrigation canals in the Peruvian Andes”. Proceedings of the National Academy of Sciences102 (47), 17241–4. o. DOI:10.1073/pnas.0508583102. PMID16284247.