Não informado. (1974). Special Education. National Council for Special Education.
Chicago-Zitierstil (17. Ausg.)Não informado. Special Education. London: National Council for Special Education, 1974.
MLA-Zitierstil (8. Ausg.)Não informado. Special Education. National Council for Special Education, 1974.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.