There is no definitive book on behavioral science in medicine. These books, however, are recommended by the behavioral science faculty because they are a good introduction to the definition of behavioral topics, including physician-patient interactions and PSP. The Sahler & Carr book is almost a combination of Feldman & Christensen and Wedding & Stuber and has more test review questions than the other books. Specific PSP sections are given below.
The Association of Faculties of Medicine of Canada, AFMC Primer on Population Health, 2021
CDC's Developmental Milestones - a checklist and facts for parents.