Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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