Hutt, M. L., & Robert, G. G. (1976). The mentally retarded child development education and treatment. Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)Hutt, Max L., agus G. Gibby Robert. The Mentally Retarded Child Development Education and Treatment. Allyn and Bacon, 1976.
Lua MLA (8ú heag.)Hutt, Max L., agus G. Gibby Robert. The Mentally Retarded Child Development Education and Treatment. Allyn and Bacon, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.