Geography, D. O. (2019). Principie Of Geography Infromation System. Obafemi Awolowo University.
Čikaški stil citiranja (17. izdanje)Geography, Department Of. Principie Of Geography Infromation System. Obafemi Awolowo University, 2019.
MLA način citiranja (9. izdanje)Geography, Department Of. Principie Of Geography Infromation System. Obafemi Awolowo University, 2019.
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