Cita APA (7a ed.)

Birkedahl, N. (1991). The habit control workbook. New Harbinger.

Cita Chicago Style (17a ed.)

Birkedahl, Nonie. The Habit Control Workbook. Oakland, California: New Harbinger, 1991.

Cita MLA (9a ed.)

Birkedahl, Nonie. The Habit Control Workbook. New Harbinger, 1991.