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