Special Learning Corporation. (1978). Readings in mental retardation (First edition.). Special Learning Corporation.
Lua i Stíl Chicago (17ú heag.)Special Learning Corporation. Readings in Mental Retardation. First edition. Connecticut: Special Learning Corporation, 1978.
Lua MLA (9ú heag.)Special Learning Corporation. Readings in Mental Retardation. First edition. Special Learning Corporation, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.