Tohutoro APA (7th ed.)
de Blij, H. J., & Birdsall, S. (1974). Essential of geography: Regions and concets. John Wiley.
Tohutoru Kātū Chicago (17th ed.)
de Blij, Harm J., me Stephen Birdsall. Essential of Geography: Regions and Concets. New York: John Wiley, 1974.
Tohutoro MLA (9th ed.)
de Blij, Harm J., me Stephen Birdsall. Essential of Geography: Regions and Concets. John Wiley, 1974.
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