Walborn, F. S. (1996). Process variables: Four common elements of counselling and psychotherapy. Brooks/Colege Pub.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWalborn, Frederick S. Process Variables: Four Common Elements of Counselling and Psychotherapy. Pacific Grove, Calif: Brooks/Colege Pub, 1996.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWalborn, Frederick S. Process Variables: Four Common Elements of Counselling and Psychotherapy. Brooks/Colege Pub, 1996.
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