L. Durland, “Telephone-Based, Clinician-Guided Self-Help Cognitive Behavioral Therapy for Depression in Parkinson’s Disease (dPD): The Responder Cases of "Alice" and "Carl," and the Nonresponder Cases of "Ethan" and ‘Gary’”, PCSP, vol. 16, no. 1, pp. 1–103, Jul. 2020.