Boehm, R. G., Armstrong, D. G., & Hunkins, . F. P. (2000). Geography: The world and its people. Glencoe/McGraw Hill.
Lua i Stíl Chicago (17ú heag.)Boehm, Richard G., David G. Armstrong, agus Francis P. Hunkins. Geography: The World and Its People. Westerville, Ohio : New York: Glencoe/McGraw Hill, 2000.
Lua MLA (8ú heag.)Boehm, Richard G., et al. Geography: The World and Its People. Glencoe/McGraw Hill, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.