Johnson, D. L., Haarmann, V., Johnson, M. L., Clawson, D. L., & Airriess, C. A. (2010). World regional geography: A development approach (10. edition.). New York: Prentice Hall.

Johnson, Douglas L., Viola Haarmann, Merrill L. Johnson, David L. Clawson, and Christopher A. Airriess. World Regional Geography: A Development Approach. 10. edition. New York: Prentice Hall, 2010.

Johnson, Douglas L., et al. World Regional Geography: A Development Approach. 10. edition. New York: Prentice Hall, 2010.