Poppen, R. (1998). Behavioral relaxation training and assessment (2nd ed.). Sage.
Chicago Style (17. basım) AtıfPoppen, Roger. Behavioral Relaxation Training and Assessment. 2nd ed. London: Sage, 1998.
MLA (9th ed.) AtıfPoppen, Roger. Behavioral Relaxation Training and Assessment. 2nd ed. Sage, 1998.
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