Cita APA (7a ed.)

Backler, A. L., & Lazarus, S. (1986). World geography. McDougal, Littell.

Cita Chicago Style (17a ed.)

Backler, Alan L., y Stuart Lazarus. World Geography. Evanston: McDougal, Littell, 1986.

Cita MLA (8a ed.)

Backler, Alan L., y Stuart Lazarus. World Geography. McDougal, Littell, 1986.