Blount, Alexander (Editor). (1998). Integrated Primary Care: The Future of Medical and Mental Health Collaboration. W. W. Norton. Still an excellent introduction to the field as a whole.
Robinson, P. & Reiter, J. (2006). Behavioral Consultation and Primary Care: A Guide to Integrating Services, Springer. Probably the best presentation of the Behavioral Health Consultant model.
Hunter, C., Goodie, J., Oordt, M., & Dobmeyer, A. (2009). Integrated Behavioral Health in Primary Care: Step-by-Step Guidance for Assessment and Intervention. American Psychological Association Press. Very much in line with the way medical providers in primary care think. A good choice for behavioral health folks who want to fit in.
James, L. & O€™Donahue, W. (Eds). (2008). The Primary Care Toolkit: Practical Resources for the Integrated Behavioral Care Provider. Springer. The title tells the tale.