1. How to worry mother;Ilingworth, R.S.; Illingworth, C.M.;Clin Pediatr (Phila),1964
2. Dick NP. The Denver prescrcening development questionnaire (PDQ);Frankenburg, W.K.; van Doorninck, W.J.; Liddell, T.N.;Pediatrics,1976
3. The Denver developmental screening test;Frankenburg, W.K.; Dobbs, J.B.;J Pediatr,1967
4. Know the normal, or else;Illingworth, R.S.;Arch Dis Child,1979
5. Does early recognition help'?;Bax, M.; MacKeith, R.C.;Dev Med Child Neurol; The detection of Klinefelter's syndrome at birth. Clin Pediatr,1974