Cita APA (7a ed.)
Bernal, I., Heyden, D., & Horcasitas, F. (1969). The Olmec world. University of California Press.
Cita Chicago Style (17a ed.)
Bernal, Ignacio, Doris Heyden, y Fernando Horcasitas. The Olmec World. Berkeley, Los Angeles: University of California Press, 1969.
Cita MLA (9a ed.)
Bernal, Ignacio, et al. The Olmec World. University of California Press, 1969.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.