Citazione Stile APA (7a Edizione)

Gabler, B., Petersen, J. F., & Trapasso, L. M. (2004). Essentials of physical geography (7. ed., Instructor's ed.). Thomson, Brooks/Cole.

Citazione stile Chigago Style (17a edizione)

Gabler, Bob, James F. Petersen, e L. Michael Trapasso. Essentials of Physical Geography. 7. ed., Instructor's ed. Belmont, Calif. [u.a.]: Thomson, Brooks/Cole, 2004.

Citatione MLA (9a ed.)

Gabler, Bob, et al. Essentials of Physical Geography. 7. ed., Instructor's ed. Thomson, Brooks/Cole, 2004.