Report on In-Class Variables: Fall 1987 & Fall 1992. US Department of Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रReport on In-Class Variables: Fall 1987 & Fall 1992. US Department of Education.
एमएलए (9वां संस्करण) प्रशस्ति पत्रReport on In-Class Variables: Fall 1987 & Fall 1992. US Department of Education.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.