1. The challenge of disability;Daitz;Am J Public Health,1965
2. Identifying the disabled: Concepts and methods in the measurement of disability;Haber;Social Security Bulletin,1967
3. The nature of disability;Burk;J Rehab (Nov–Dec),1967
4. Disability and Rehabilitation;Nagi,1969
5. A new approach to the objective evaluation of physical disability;Sokolow;J Chron Dis,1962