Enger, E. D., Smith, B. F., & Smith, B. F. (2000). Environmental science: A study of interrelationships (7th ed.). Boston, Mass: McGraw-Hill.
Παραπομπή Chicago StyleEnger, Eldon D., Bradley Fraser Smith, and Bradley F. Smith. Environmental Science: A Study of Interrelationships. 7th ed. Boston, Mass: McGraw-Hill, 2000.
Παραπομπή MLAEnger, Eldon D., Bradley Fraser Smith, and Bradley F. Smith. Environmental Science: A Study of Interrelationships. 7th ed. Boston, Mass: McGraw-Hill, 2000.
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