Wright, S. M. (1972). Teaching the number system to intermediate educable mentally retarded pupils through the use of variety of methods.
Chicago-viite (17. p.)Wright, Scott Mathews. Teaching the Number System to Intermediate Educable Mentally Retarded Pupils Through the Use of Variety of Methods. 1972.
MLA-viite (9. p.)Wright, Scott Mathews. Teaching the Number System to Intermediate Educable Mentally Retarded Pupils Through the Use of Variety of Methods. 1972.
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