Bernal, I., Heyden, D., & Horcasitas, F. (1969). The Olmec world. University of California Press.
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Chicago-čujuhus (17. p.)
Bernal, Ignacio, Doris Heyden, juo Fernando Horcasitas. The Olmec World. Berkeley, Los Angeles: University of California Press, 1969.
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MLA-čujuhus (9. p.)
Bernal, Ignacio, et al. The Olmec World. University of California Press, 1969.
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