Cita APA (7a ed.)

Keach, E. T., Barnes, B. R., & Anderson, L. F. (1976). The world around us. Houghton Mifflin.

Cita Chicago Style (17a ed.)

Keach, Everett T., Buckley R. Barnes, y Lee F. Anderson. The World Around Us. Boston [u.a.]: Houghton Mifflin, 1976.

Cita MLA (9a ed.)

Keach, Everett T., et al. The World Around Us. Houghton Mifflin, 1976.