Ehlers, W. H., Krishef, C. H., and Prothero, J. C. An introduction to mental retardation: A programmed text. Columbus, OH: Charles E. Merrill, 1977, 384 pp., $9.95

• Book ID: 101362038
• Publisher: John Wiley and Sons
• Year: 1978
• Tongue: English
• Weight: 166 KB
• Volume: 15
• Category: Article
• ISSN: 0033-3085
• DOI: 10.1002/1520-6807(197810)15:4<606::aid-pits2310150428>3.0.co;2-1