Tài liệu tham khảo WikiPedia: Voi_sa_mạc http://newswatch.nationalgeographic.com/2009/05/25... http://www.saudiaramcoworld.com/issue/200005/shari... http://www.smithsonianmag.com/science-nature/Savin... http://www.desertelephant.org/elephant-conservatio... http://www.desertelephantconservation.org/AboutDes... http://www.etoshanationalpark.co.za/faunaflora/wil... https://web.archive.org/web/20140210050801/http://... https://web.archive.org/web/20160412113136/http://...
