Cita APA (7th ed.)
Boehm, R. G., Armstrong, D. G., & Hunkins, F. P. (2002). Geography: The world and its people. Glencoe/ McGraw-Hill.
Cita Chicago (17th ed.)
Boehm, Richard G., David G. Armstrong, i Francis P. Hunkins. Geography: The World and Its People. New York: Glencoe/ McGraw-Hill, 2002.
Cita MLA (9th ed.)
Boehm, Richard G., et al. Geography: The World and Its People. Glencoe/ McGraw-Hill, 2002.
Atenció: Aquestes cites poden no estar 100% correctes.