Dyfyniad APA

Boehm, R. G., Armstrong, D. G., & Hunkins, F. P. Geography: The world and its people.

Dyfyniad Arddull Chicago

Boehm, Richard G., David G. Armstrong, and Francis P. Hunkins. Geography: The World and Its People.

Dyfyniad MLA

Boehm, Richard G., et al. Geography: The World and Its People.

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