APA-referens (7:e uppl.)
Robertson, M. G., Rands, R. L., & Graham, J. A. (1972). Maya sculpture from the southern lowlands, the highlands, and Pacific piedmont, Guatemala, Mexico, Honduras. Lederer, Street & Zeus.
Chicago-referens (17:e uppl.)
Robertson, Merle Greene, Robert L. Rands, och John Allen Graham. Maya Sculpture from the Southern Lowlands, the Highlands, and Pacific Piedmont, Guatemala, Mexico, Honduras. Berkeley, California: Lederer, Street & Zeus, 1972.
MLA-referens (9:e uppl.)
Robertson, Merle Greene, et al. Maya Sculpture from the Southern Lowlands, the Highlands, and Pacific Piedmont, Guatemala, Mexico, Honduras. Lederer, Street & Zeus, 1972.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.