Cronbach, L.J. (1951) "Coefficient alpha and the internal structure of tests." Psychometrika16: 297-334.
2.
Dunn, L.M. (1968) "Special education for the mildy retarded-is much of it justifiable?" Exceptional Children35, 1: 5-24.
3.
Haring, M.G., G.G. Stern, and W.M. Cruickshank (1958) Attitudes of Educators Toward Exceptional Children. Syracuse University Special Education and Rehabilitation Monograph Series No. 3.
4.
Johnson, G.O. (1962) "Special education for the mentally handicapped-a paradox." Exceptional Children29, 2: 62-69.
5.
Kerlinger, F.N. (1964) Foundations of Behavioral Research. New York: Holt, Rinehart & Winston.
6.
Mackie, R.P. (1964) "Special education reaches nearly two million children ." School Life47: 8-9.
7.
Maryland State Department of Education (1969 ) A Design for a Continuum of Special Education Services: Including a Proposal for a Pilot Study. Division of Instruction (June).
8.
Osgood, C.E., G.J. Suci, and P.M. Tannenbaum (1957) The Measurement of Meaning . Urbana: Univ. of Illinois Press .
9.
Reynolds, M.A. (1962) "A framework for considering some issues in special education." Exceptional Children28, 7: 367-370.
10.
Sage, D.D. (1967) The Development of Simulation Materials for Research and Training in Administration of Special Education. Syracuse : Syracuse University.
11.
U.S. Office of Education (1969) Statistical Data Fiscal Year 1968. Washington, D.C.: Bureau of Education for the Handicapped.
12.
Veldman, D.J. (1967) Fortran Programming for the Behavioral Sciences . New York: Holt, Rinehart & Winston.
13.
Voelker, P. and F. Mullen (1963) "Organization, administration and supervision of special education." Rev. of Educational Research33: 5-19.