APA

American Association on Intellectual and developmental disabilities, .Intellectual disability: definition, classification and system of supports. United States of America: American Association on Intellectual and developmental disabilities: .

Chicago

American Association on Intellectual and developmental disabilities, .Intellectual disability: definition, classification and system of supports. United States of America: American Association on Intellectual and developmental disabilities: .

Harvard

American Association on Intellectual and developmental disabilities, .Intellectual disability: definition, classification and system of supports. United States of America: American Association on Intellectual and developmental disabilities: .

MLA

American Association on Intellectual and developmental disabilities, .United States of America: American Association on Intellectual and developmental disabilities: . .