Cummings, J. L., & Thomas, J. (2000). The value of psychological treatment: The collected papers of Nicholas A. Cummings. Zeig, Tucker & Co..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCummings, Janet L., और J.Lawrence Thomas. The Value of Psychological Treatment: The Collected Papers of Nicholas A. Cummings. Phoenix: Zeig, Tucker & Co., 2000.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCummings, Janet L., और J.Lawrence Thomas. The Value of Psychological Treatment: The Collected Papers of Nicholas A. Cummings. Zeig, Tucker & Co., 2000.
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