Joyce, W.; Oana, R. G.; and Houston, W. R. (Eds.) Elementary Education in the Seventies. New York: Holt Rinehart and Winston, 1970. pp. 103-125.
2.
Lockard, J. D. (Ed.) Report of the International Clearinghouse on Science and Mathematics Curricular Developments. College Park, Maryland: Science Teaching Center, University of Maryland, 1970.
3.
Suydam, M.N. and Riedesel, A.C. "Interpretive Study of Research and Development in Elementary School Mathematics, Volume 3: Developmental Projects." Office of Education, Department of Health, Education and Welfare Project No. 8-0586, June, 1969.
4.
CIJE (Current Index to Journals In Education) and RIE (Research In Education) are obtainable from the ERIC Document Reproduction Service, U.S. Government Printing Office, Washington, D.C. 20402.
