MLA

Bass, Christopher, and R. H Cawley. Somatization : Physical Symptoms and Psychological Illness. Oxford: Blackwell, 1990.

APA

Bass, C., & Cawley, R. H. (1990). Somatization : physical symptoms and psychological illness. Oxford: Blackwell.

Chicago

Cawley, R. H. Somatization: Physical Symptoms and Psychological Illness. Edited by Christopher Bass. Oxford: Blackwell, 1990.