(1969). Problems and solutions for students. Academic Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रProblems and Solutions for Students. New York: Academic Press, 1969.
एमएलए (9वां संस्करण) प्रशस्ति पत्रProblems and Solutions for Students. Academic Press, 1969.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.