Stiling, P. D. (1992). Introductory ecology. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Stiling, Peter D. Introductory Ecology. Englewood Cliffs, N.J: Prentice Hall, 1992.
Lua MLA (9ú heag.)Stiling, Peter D. Introductory Ecology. Prentice Hall, 1992.
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