Enger, E. D., & Smith , B. F. (2004). Environmental Science : a study of: Interrelationships (9th ed.). McGraw-Hill.
Citace podle Chicago (17th ed.)Enger, Eldon D., a Bradley F. Smith. Environmental Science : a Study of: Interrelationships. 9th ed. Boston: McGraw-Hill, 2004.
Citace podle MLA (9th ed.)Enger, Eldon D., a Bradley F. Smith. Environmental Science : a Study of: Interrelationships. 9th ed. McGraw-Hill, 2004.
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