APA (7 वां संस्करण) प्रशस्ति पत्र

Smith, T. M., & Smith, R. L. (2015). Elements of ecology (Ninth edition, Global edition.). PearsonEducational Limited.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Smith, Thomas M., और Robert Leo Smith. Elements of Ecology. Ninth edition, Global edition. Harlow Essex, England: PearsonEducational Limited, 2015.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Smith, Thomas M., और Robert Leo Smith. Elements of Ecology. Ninth edition, Global edition. PearsonEducational Limited, 2015.