APA (7th ed.) Citation

Poppen, R. (1995). Joseph Wolpe. Sage.

Chicago Style (17th ed.) Citation

Poppen, Roger. Joseph Wolpe. London: Sage, 1995.

MLA (9th ed.) Citation

Poppen, Roger. Joseph Wolpe. Sage, 1995.

Warning: These citations may not always be 100% accurate.