Cita APA (7a ed.)

Copeland, M. E. (1998). The worry control workbook. New Harbinger.

Cita Chicago Style (17a ed.)

Copeland, Mary Ellen. The Worry Control Workbook. Oakland, California: New Harbinger, 1998.

Cita MLA (9a ed.)

Copeland, Mary Ellen. The Worry Control Workbook. New Harbinger, 1998.