1. Bayley Scales of Infant Development;Bayley,1969
2. Bayley Scales of Infant Development;Bayley,1993
3. Prevalence of selected maternal behaviors and experiences, Pregnancy Risk Assessment Monitoring System (PRAMS), 1999. Morbidity & Mortality Weekly Report;Beck;Surveillance Summaries,2002
4. Infant discrimination of rapid auditory cues predicts later language impairment;Benasich;Behavioural Brain Research,2002
5. Biopac. #AS105. 2008 [cited; Available from: http://www.biopac.com/Manuals/app_pdf/app105b.pdf.