Grad, F. P. (1978). Environmental law: Sources and problems (2nd ed.). M. Bender.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGrad, Frank P. Environmental Law: Sources and Problems. 2nd ed. New York: M. Bender, 1978.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGrad, Frank P. Environmental Law: Sources and Problems. 2nd ed. M. Bender, 1978.
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