Krohne, D. T. (1998). General ecology. Wadsworth Pub. Co.
Lua i Stíl Chicago (17ú heag.)Krohne, David T. General Ecology. Belmont, CA: Wadsworth Pub. Co, 1998.
Lua MLA (8ú heag.)Krohne, David T. General Ecology. Wadsworth Pub. Co, 1998.
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