Lua APA (7ú heag.)

KEETON, W. T. (1980). Biological science.-- ed.3. W.W Norton and co.

Lua i Stíl Chicago (17ú heag.)

KEETON, William T. Biological Science.-- Ed.3. New York: W.W Norton and co, 1980.

Lua MLA (9ú heag.)

KEETON, William T. Biological Science.-- Ed.3. W.W Norton and co, 1980.

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