Boehm, R. G., Armstrong, D. G., & Hunkins, F. P. Geography: The world and its people.
Lua i Stíl Chicago (17ú heag.)Boehm, Richard G., David G. Armstrong, agus Francis P. Hunkins. Geography: The World and Its People.
Lua MLA (8ú heag.)Boehm, Richard G., et al. Geography: The World and Its People.
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