1. Anderson, D. W. (1969). What makes writing legible.Elementary School J. 68: 365–369.
2. Bandura, A. (1969).Principles of Behavior Modification, Holt, Rinehart & Winston, New York.
3. Bellamy, T., and Brown, L. A. (1972). A sequential procedure for teaching addition skills to trainable retarded students.Training School Bull. 69: 31–44.
4. Bornstein, P. H., and Quevillon, R. P. (1976). The effects of self-instructional training on over active preschool boys.J. Appl. Behav. Anal. 9: 179–188.
5. Brown, L. A. (1973). Instructional programs for trainable level retarded students. In Mann, L., and Sabatino, D. (eds.),The First Review of Special Education, Vol. 1, JSE Press, Philadelphia, pp. 3–76.