APA (7 वां संस्करण) प्रशस्ति पत्र
Williamson, E. G., Cowan, J. L., Crawford, R. G., & Willems, V. (1966). The American student's freedom of expression: A research appraisal. University of Minnesota Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Williamson, E. G., John L. Cowan, R. George Crawford, और Virginia Willems. The American Student's Freedom of Expression: A Research Appraisal. Minneapolis: University of Minnesota Press, 1966.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Williamson, E. G., et al. The American Student's Freedom of Expression: A Research Appraisal. University of Minnesota Press, 1966.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.