May, Wayne N., THIS LAND: They Came from the East, Vol. 3, pp. 12-15; Olive, P.C.Arxivat 2010-01-09 a Wayback Machine., The Lost Empires & Vanished Races of Prehistoric America, pg. 39
May, Wayne N., THIS LAND: They Came from the East, Vol. 3, pp. 12-15; Olive, P.C.Arxivat 2010-01-09 a Wayback Machine., The Lost Empires & Vanished Races of Prehistoric America, pg. 39