APA-viite (7. p.)
Clewlow, W. C. (1967). Colossal heads of the Olmec culture. University of California Archaeological Research Facility.
Chicago-viite (17. p.)
Clewlow, William C. Colossal Heads of the Olmec Culture. Berkeley: University of California Archaeological Research Facility, 1967.
MLA-viite (9. p.)
Clewlow, William C. Colossal Heads of the Olmec Culture. University of California Archaeological Research Facility, 1967.
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