United States. (1991). Selected environmental law statutes (1991-92 educational ed.). West Pub. Co.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited States. Selected Environmental Law Statutes. 1991-92 educational ed. St. Paul, Minn: West Pub. Co, 1991.
एमएलए (9वां संस्करण) प्रशस्ति पत्रUnited States. Selected Environmental Law Statutes. 1991-92 educational ed. West Pub. Co, 1991.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.