Fletcher-Janzen, Elaine (March 2018). «Hereditary Spastic Paraplegia». En Cecil R. Reynolds; Kimberly J. Vannest; Elaine Fletcher-Janzen, eds. Encyclopedia of special education, Volume 2. A reference for the education of children, adolescents, and adults with disabilities and other exceptional individuals. John Wiley & Sons. ISBN978-0-470-94939-9.