APA
Johnson D. L., Airriess C. A., . (2009). World regional geography. Upper Saddle River, NJ: Pearson Prentice Hall.
Chicago
Johnson Douglas L, Airriess Christopher A, . 2009. World regional geography. Upper Saddle River, NJ: Pearson Prentice Hall.
Harvard
Johnson D. L., Airriess C. A., . (2009). World regional geography. Upper Saddle River, NJ: Pearson Prentice Hall.
MLA
Johnson Douglas L, Airriess Christopher A, . World regional geography. Upper Saddle River, NJ: Pearson Prentice Hall. 2009.