APA (7th ed.) Citation

Penzel, F. (2003). The hair-pulling problem: A complete guide to trichotillomania. Oxford University Press.

Chicago Style (17th ed.) Citation

Penzel, Fred. The Hair-pulling Problem: A Complete Guide to Trichotillomania. Oxford ; New York: Oxford University Press, 2003.

MLA (9th ed.) Citation

Penzel, Fred. The Hair-pulling Problem: A Complete Guide to Trichotillomania. Oxford University Press, 2003.