Valerie J. Bradley

The Feasibility of Adopting a Functional Definition of Disabilities: A Policy Analysis and Recommendations.

Valerie J. Bradley, 1988 .

Intellectual Disability: Definition, Classification, and Systems of Supports. Eleventh Edition.

Robert L. Schalock, Ruth Luckasson, Yves Lachapelle, 2009 .

Quality of life : for people with intellectual and other developmental disabilities : applications across individuals, organizations, communities, and systems

Robert L. Schalock, James F. Gardner, Valerie J. Bradley, 2007 .