Cita APA (7a ed.)

Kimmel, A., Backler, A., & Lazarus, S. (1980). World geography. Science Research Assoc.

Cita Chicago Style (17a ed.)

Kimmel, Alan, Alan Backler, y Stuart Lazarus. World Geography. Chicago [u.a.]: Science Research Assoc, 1980.

Cita MLA (9a ed.)

Kimmel, Alan, et al. World Geography. Science Research Assoc, 1980.