Cita APA (7th ed.)
Bernal, I., Heyden, D., & Horcasitas, F. (1969). The Olmec world. University of California Press.
Cita Chicago (17th ed.)
Bernal, Ignacio, Doris Heyden, i Fernando Horcasitas. The Olmec World. Berkeley, Los Angeles: University of California Press, 1969.
Cita MLA (9th ed.)
Bernal, Ignacio, et al. The Olmec World. University of California Press, 1969.
Atenció: Aquestes cites poden no estar 100% correctes.