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- [48] HISTORICAL SKETCH OF RECREATION FOR MENTALLY RETARDED (1920-1968) MENTAL RETARDATION, 1971, 9 (01): : 50 - 53
- [49] FREQUENCY WITH WHICH THE MENTALLY-RETARDED PARTICIPATE IN RECREATION ACTIVITIES RESEARCH QUARTERLY, 1979, 50 (01): : 71 - 79
- [50] EDUCATION OF MENTALLY-RETARDED CHILDREN FOURTEEN YEARS OF AGE AND BEYOND AMERICAN JOURNAL OF MENTAL DEFICIENCY, 1951, 56 (03): : 560 - 569