Poppen, R. (1995). Joseph Wolpe. Sage Publications.
芝加哥风格引文Poppen, Roger. Joseph Wolpe. London ; Thousand Oaks, Calif.: Sage Publications, 1995.
MLA引文Poppen, Roger. Joseph Wolpe. Sage Publications, 1995.
警告：这些引文格式不一定是100％准确.
APA引文