Liroff, R. A. (1976). A National policy for the environment: Nepa and its aftermath. Indiana U.Pr.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLiroff, Richard A. A National Policy for the Environment: Nepa and Its Aftermath. London: Indiana U.Pr, 1976.
एमएलए (9वां संस्करण) प्रशस्ति पत्रLiroff, Richard A. A National Policy for the Environment: Nepa and Its Aftermath. Indiana U.Pr, 1976.
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