Nielsen, S. N., & Briann D. Fath and other. (2020). A New Ecology system perspective (second edition.). Elsevier.
Παραπομπή σε μορφή Chicago (17η εκδ.)Nielsen, Soren Nors, και Briann D. Fath and other. A New Ecology System Perspective. second edition. united Kingdom: Elsevier, 2020.
Παραπομπή σε μορφή MLA (9th εκδ.)Nielsen, Soren Nors, και Briann D. Fath and other. A New Ecology System Perspective. second edition. Elsevier, 2020.