1. Sppech and hearing problems in a high-risk population;Ballot;South African Medical Journal,1992
2. The Bayley scales of infant development;Bayley,1969
3. Prevalence of speech and language disorders in 5-year-old kindergarten children in the Ottowa-Carlton region;Beitchman;Journal of Speech and Hearing Disorden,1986
4. Stability of cognitive performance of children with developmental delays;Bernheimer;American journal on Mental Retardation,1988
5. Language screening for infants prone to otitis media;Black;Journal of Pediatric Psychology,1988