Simmons, I. G. (1991). Earth, air, and water: Resources and environment in the late 20th century. E. Arnold.
Citace podle Chicago (17th ed.)Simmons, Ian Gordon. Earth, Air, and Water: Resources and Environment in the Late 20th Century. London: E. Arnold, 1991.
Citace podle MLA (9th ed.)Simmons, Ian Gordon. Earth, Air, and Water: Resources and Environment in the Late 20th Century. E. Arnold, 1991.
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