Gaya APA

Clark, D, A., Beck, A, T. (2010). Cognitive Therapy of Anxiety Disorders: Science and Practice . United States of America: The Guildford Press.

Gaya MLA

Clark, David, A.., Beck, Aaron, T.. "Cognitive Therapy of Anxiety Disorders: Science and Practice". United States of America: The Guildford Press, 2010. Text.