Irwin, O. C. (1947). Development of speech during infance: Curve of phonemic frequencies. Journal of Experimental Psychology, 37, 187-193. [FULLTEXT]
A History of Psycholinguistics
Bibliography for Levelt (2013)
Irwin, O. C. (1947). Development of speech during infance: Curve of phonemic frequencies. Journal of Experimental Psychology, 37, 187-193. [FULLTEXT]