Warner, F., & Thrapp, R. (1972). Readings in controversial issues in education of the mentally retarded. MSS Information Corp.
Chicago-viite (17. p.)Warner, Frank, ja Robert Thrapp. Readings in Controversial Issues in Education of the Mentally Retarded. New York: MSS Information Corp, 1972.
MLA-viite (8. p.)Warner, Frank, ja Robert Thrapp. Readings in Controversial Issues in Education of the Mentally Retarded. MSS Information Corp, 1972.
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