Haring, N. G. (1976). Special education for the severely handicapped: The state of the art in 1975. Council for Exceptional Children.
Lua i Stíl Chicago (17ú heag.)Haring, Norris G. Special Education for the Severely Handicapped: The State of the Art in 1975. Reston, Va.: Council for Exceptional Children, 1976.
Lua MLA (8ú heag.)Haring, Norris G. Special Education for the Severely Handicapped: The State of the Art in 1975. Council for Exceptional Children, 1976.
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