Παραπομπή σε μορφή APA (7η εκδ.)

Powers, E., & Witmer, H. (1951). An experiment in the prevention of delinquency: The Cambridge-Somerville Youth Study. Columbia University Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Powers, Edwin, και Helen Witmer. An Experiment in the Prevention of Delinquency: The Cambridge-Somerville Youth Study. New York: Columbia University Press, 1951.

Παραπομπή σε μορφή MLA (9th εκδ.)

Powers, Edwin, και Helen Witmer. An Experiment in the Prevention of Delinquency: The Cambridge-Somerville Youth Study. Columbia University Press, 1951.