APA (7 वां संस्करण) प्रशस्ति पत्र

Frederick, K. D., & Sedjo, R. A. (1991). America's renewable resources: Historical trends and current challenges. Resources for the Future.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Frederick, Kenneth D., और Roger A. Sedjo. America's Renewable Resources: Historical Trends and Current Challenges. Washington, D.C: Resources for the Future, 1991.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Frederick, Kenneth D., और Roger A. Sedjo. America's Renewable Resources: Historical Trends and Current Challenges. Resources for the Future, 1991.