Krebs, C. J. (2009). Ecology: The experimental analysis of distribution and abundance (Sixth edition.). Pearson Benjamin Cummings.
Lua i Stíl Chicago (17ú heag.)Krebs, Charles J. Ecology: The Experimental Analysis of Distribution and Abundance. Sixth edition. San Francisco: Pearson Benjamin Cummings, 2009.
Lua MLA (9ú heag.)Krebs, Charles J. Ecology: The Experimental Analysis of Distribution and Abundance. Sixth edition. Pearson Benjamin Cummings, 2009.
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