APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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