Kemp, D. D. (1994). Global Environmental Issues A Oil Matological Approach David D. Kemp. Routledge.
Lua i Stíl Chicago (17ú heag.)Kemp, David D. Global Environmental Issues A Oil Matological Approach David D. Kemp. Routledge, 1994.
Lua MLA (8ú heag.)Kemp, David D. Global Environmental Issues A Oil Matological Approach David D. Kemp. Routledge, 1994.
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