Nielsen, S. N., & Briann D. Fath and other. (2020). A New Ecology system perspective (second edition.). Elsevier.
Lua i Stíl Chicago (17ú heag.)Nielsen, Soren Nors, agus Briann D. Fath and other. A New Ecology System Perspective. second edition. united Kingdom: Elsevier, 2020.
Lua MLA (9ú heag.)Nielsen, Soren Nors, agus Briann D. Fath and other. A New Ecology System Perspective. second edition. Elsevier, 2020.
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