Butler, N. R., Peckham, C., & Sheridan, M. (1973). Speech Defects in Children Aged 7 Years: A National Study.
Chicago Stili AlıntıButler, Neville R., Catherine Peckham, ve Mary Sheridan. Speech Defects in Children Aged 7 Years: A National Study. 1973.
MLA AlıntıButler, Neville R., Catherine Peckham, ve Mary Sheridan. Speech Defects in Children Aged 7 Years: A National Study. 1973.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..