Smith, M. E. (1926). An investigation of the development of the sentence and the extent of vocabulary in young children. PhD Thesis, University of Iowa Press, Iowa City. [FULLTEXT]
A History of Psycholinguistics
Bibliography for Levelt (2013)

Smith, M. E. (1926). An investigation of the development of the sentence and the extent of vocabulary in young children. PhD Thesis, University of Iowa Press, Iowa City. [FULLTEXT]