APA (7th ed.) Citation

Gruener, J. C. (1987). The Olmec riddle: An inquiry into the origin of pre-Columbian civilization. Vengreen Publications.

Chicago Style (17th ed.) Citation

Gruener, James C. The Olmec Riddle: An Inquiry into the Origin of Pre-Columbian Civilization. Rancho Santa Fe, Calif.: Vengreen Publications, 1987.

MLA (9th ed.) Citation

Gruener, James C. The Olmec Riddle: An Inquiry into the Origin of Pre-Columbian Civilization. Vengreen Publications, 1987.