-. Annual Report of The Librarian of Conggres: For the fiscal year ending June 30, 1972. Goverment Printing Office.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र-. Annual Report of The Librarian of Conggres: For the Fiscal Year Ending June 30, 1972. Goverment Printing Office.
एमएलए (8वां संस्करण) प्रशस्ति पत्र-. Annual Report of The Librarian of Conggres: For the Fiscal Year Ending June 30, 1972. Goverment Printing Office.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.