National Research Council (U.S.). Panel on Selection and Placement of Students in Programs for the Mentally Retarded, National Research Council (U.S.). Committee on Child Development Research and Public Policy, Heller, K. A., Holtzman, W. H., & Messick, S. (1982). Placing children in special education: A strategy for equity. National Academy Press.

National Research Council (U.S.). Panel on Selection and Placement of Students in Programs for the Mentally Retarded, National Research Council (U.S.). Committee on Child Development Research and Public Policy, Kirby A. Heller, Wayne H. Holtzman, и Samuel Messick. Placing Children in Special Education: A Strategy for Equity. Washington, D.C.: National Academy Press, 1982.

National Research Council (U.S.). Panel on Selection and Placement of Students in Programs for the Mentally Retarded, et al. Placing Children in Special Education: A Strategy for Equity. National Academy Press, 1982.