Tercera Mesa Redonda de Palenque, Vol. IV : proceedings of the Tercera Mesa Redonda de Palenque, June 11-18, 1978, Palenque ; a conference on the art, hieroglyphics, and historic approaches of the Late Classic Maya - Robertson, Merle Greene; Jeffers, Donnan Call (Pre-Columbian Art Research, Herald Printers, 1979)