Ayers, J. B. and Johnson, C. E.The development of a prognostic test for early childhood . Unpublished manuscript, Research and Development Center in Educational Stimulation, University of Georgia, 1969 .
2.
Ayers, J. B. and Powell, L. D.What can young children learn and when? Nation's Schools, 1969, 83, 82-3.
3.
Gagné, R. M.The psychological bases of Science—A process approach. AAAS Miscellaneous Publication 65-8. Washington, D. C.: American Association for the Advancement of Science, 1965.
4.
Powell, L. D. and Johnson, C. E.Clayton county seeks some answers. NEA Journal, 1967, 18, 36-7.
