Nielsen, S. N., & Briann D. Fath and other. (2020). A New Ecology system perspective (second edition.). Elsevier.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNielsen, Soren Nors, और Briann D. Fath and other. A New Ecology System Perspective. second edition. united Kingdom: Elsevier, 2020.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNielsen, Soren Nors, और Briann D. Fath and other. A New Ecology System Perspective. second edition. Elsevier, 2020.