Hobbs, J. J. (2009). World regional geography (6th ed.). Brooks/Cole, Cengage Learning.
Chicago Style (17. basım) AtıfHobbs, Joseph John. World Regional Geography. 6th ed. Belmont, Calif: Brooks/Cole, Cengage Learning, 2009.
MLA (9th ed.) AtıfHobbs, Joseph John. World Regional Geography. 6th ed. Brooks/Cole, Cengage Learning, 2009.
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