Department, G. (2019). Regional Geography of North America. Obafemi Awolowo University.
Čikaški stil citiranja (17. izdanje)Department, Geography. Regional Geography of North America. Obafemi Awolowo University, 2019.
MLA način citiranja (9. izdanje)Department, Geography. Regional Geography of North America. Obafemi Awolowo University, 2019.
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