1. The Child's Path to Spoken Language;Locke,1993
2. The sounds of infants;Murai;Studia Phonologica,1963
3. A comparative study of the speech developments of Japanese and American English in childhood (1)—A comparison of the developments of voices at the prelinguistic period;Nakazima;Studia Phonologica,1962
4. The emergence of the sounds of speech in infancy;Oller,1980
5. Vom ersten Schrei zum ersten Wort: Anfänge der Sprachentwicklung in der vorsprachlichen Kommunikation;Papoušek,1994