American Medical Association. (2012). Principles of CPT Coding. Amer Medical Assn.
Rowell, J. A. C., & Green, M. A. (2015). Understanding health insurance: A guide to professional billing. Clifton Park, NY: Delmar Learning.
Medical reference books are a great place to start your research. All of these are available online-off campus you will need your barcode for access: