Colvin, S. S., & Allen, R. D. (1923). Mental tests and linguistic ability. Journal of Educational Psychology, 14(1), 1-20. doi:10.1037/h0073885. [FULLTEXT]
A History of Psycholinguistics
Bibliography for Levelt (2013)

Colvin, S. S., & Allen, R. D. (1923). Mental tests and linguistic ability. Journal of Educational Psychology, 14(1), 1-20. doi:10.1037/h0073885. [FULLTEXT]