Neisworth, J. T., & Smith, R. M. (1978). Retardation: Issues, assessment, and intervention. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Neisworth, John T., agus Robert McNeil Smith. Retardation: Issues, Assessment, and Intervention. New York: McGraw-Hill, 1978.
Lua MLA (8ú heag.)Neisworth, John T., agus Robert McNeil Smith. Retardation: Issues, Assessment, and Intervention. McGraw-Hill, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.