1. Doescher MP Fordyce MA Skillman SM Jackson JE Rosenblatt RA Persistent Primary Care Health Professional Shortage Areas (HPSAs) and Health Care Access in Rural Areas http://depts.washington.edu/uwrhrc/uploads/Persistent_HPSAs_PB.pdf
2. National Rural Health Association Recruitment and Retention of a Quality Health Workforce in Rural Areas: A Series of Policy Papers on The Rural Health Careers Pipeline; Number 1: Physicians http://www.ruralhealthweb.org/go/left/policy-and-advocacy/policy-documents-and-statements/official-nrha-policy-positions#WrkfrceSeries
3. WWAMI Rural Health Research Center. RUCA Data, Code Definitions http://depts.washington.edu/uwruca/ruca-codes.php
4. Fordyce MA Chen FM Doescher MP Hart LG 2005 Physician Supply and Distribution in Rural Areas of the United States http://depts.washington.edu/uwrhrc/uploads/RHRC%20FR116%20Fordyce.pdf