Simmons, I. (1991). Earth, air and water: Resources and environment in the late 20th century. Edward Arnold.
Lua i Stíl Chicago (17ú heag.)Simmons, I.G. Earth, Air and Water: Resources and Environment in the Late 20th Century. London: Edward Arnold, 1991.
Lua MLA (9ú heag.)Simmons, I.G. Earth, Air and Water: Resources and Environment in the Late 20th Century. Edward Arnold, 1991.
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