Powers, E., & Witmer, H. (1951). An experiment in the prevention of delinquency: The Cambridge-Somerville Youth Study. Columbia University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPowers, Edwin, और Helen Witmer. An Experiment in the Prevention of Delinquency: The Cambridge-Somerville Youth Study. New York: Columbia University Press, 1951.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPowers, Edwin, और Helen Witmer. An Experiment in the Prevention of Delinquency: The Cambridge-Somerville Youth Study. Columbia University Press, 1951.
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