Participants assigned to the TH-CBT group will receive a 10-chapter CBT self-help treatment workbook, tailored to the unique needs of people with PD, immediately following enrollment. Participants will read and complete one treatment module per week (approximately 60 minutes per module plus practice exercises throughout the week). The treatment materials will review different coping skills for the effective management of depression. Study therapists will call participants to review the treatment material over the phone every week (after every chapter) or every other week (after ever 2 chapters), based on participant needs. These telephone-based counseling sessions will last 60 minutes. It will take approximately 10 weeks to complete the study treatment materials.