APA-referens (7:e uppl.)
Drucker, P. (1943). Ceramic sequences at Tres Zapotes, Veracruz, Mexico. United States Government Printing Office.
Chicago-referens (17:e uppl.)
Drucker, Philip. Ceramic Sequences at Tres Zapotes, Veracruz, Mexico. Washington: United States Government Printing Office, 1943.
MLA-referens (9:e uppl.)
Drucker, Philip. Ceramic Sequences at Tres Zapotes, Veracruz, Mexico. United States Government Printing Office, 1943.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.