Blake, K. A. (1974). Teaching the retarded. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Blake, Kathryn A. Teaching the Retarded. Englewood Cliffs, N.J: Prentice-Hall, 1974.
Lua MLA (9ú heag.)Blake, Kathryn A. Teaching the Retarded. Prentice-Hall, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.