APA-čujuhus (7. p.)
de Blij, H. J., & Birdsall, S. (1974). Essential of geography: Regions and concets. John Wiley.
Chicago-čujuhus (17. p.)
de Blij, Harm J., juo Stephen Birdsall. Essential of Geography: Regions and Concets. New York: John Wiley, 1974.
MLA-čujuhus (9. p.)
de Blij, Harm J., juo Stephen Birdsall. Essential of Geography: Regions and Concets. John Wiley, 1974.
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