Kupchella, C. E., & Hyland, M. C. (1993). Environmental science. Living within the system of nature (3rd ed.). Prentice-Hall International.
Citace podle Chicago (17th ed.)Kupchella, Charles E., a Margaret C. Hyland. Environmental Science. Living Within the System of Nature. 3rd ed. Englewood Cliffs: Prentice-Hall International, 1993.
Citace podle MLA (9th ed.)Kupchella, Charles E., a Margaret C. Hyland. Environmental Science. Living Within the System of Nature. 3rd ed. Prentice-Hall International, 1993.
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