Παραπομπή APA

Enger, E. D., Smith, B. F., & Smith, B. (1998). Environmental science: A study of interrelationships (6th ed.). Boston, Mass.: WCB/McGraw Hill.

Παραπομπή Chicago Style

Enger, Eldon D., Bradley F. Smith, and Bradley Smith. Environmental Science: A Study of Interrelationships. 6th ed. Boston, Mass.: WCB/McGraw Hill, 1998.

Παραπομπή MLA

Enger, Eldon D., Bradley F. Smith, and Bradley Smith. Environmental Science: A Study of Interrelationships. 6th ed. Boston, Mass.: WCB/McGraw Hill, 1998.

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