Turk, J. (1984). Environmental Science Jonathan Turk And Amos Turk. Saunders College Pub.
Lua i Stíl Chicago (17ú heag.)Turk, Jonathan. Environmental Science Jonathan Turk And Amos Turk. Saunders College Pub, 1984.
Lua MLA (8ú heag.)Turk, Jonathan. Environmental Science Jonathan Turk And Amos Turk. Saunders College Pub, 1984.
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