Here is the original reference to the February, 2007, 3-page consensus document that describes the Joint Principles of the Patient Centered Medical Home. It was created by the four professional societies that are focused on primary care: American Academy of Family Physicians (AAFP), American Academy of Pediatrics (AAP), American College of Physicians (ACP), and American Osteopathic Association (AOA).
Very simple and straight-forward.
http://www.pcpcc.net/content/joint-principles-patient-centered-medical-home