Astin, A. W., & Lee, C. B. T. (1972). The invisible colleges: A profile of small, private colleges with limited resources. McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAstin, Alexander W., और Calvin B. T. Lee. The Invisible Colleges: A Profile of Small, Private Colleges with Limited Resources. New York: McGraw-Hill, 1972.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAstin, Alexander W., और Calvin B. T. Lee. The Invisible Colleges: A Profile of Small, Private Colleges with Limited Resources. McGraw-Hill, 1972.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.