Staats, A. W., & Staats, C. K. (1959). Meaning and m: Correlated but separate. Psychological Review, 66, 136-144. doi:10.1037/h0047970. [FULLTEXT]
A History of Psycholinguistics
Bibliography for Levelt (2013)

Staats, A. W., & Staats, C. K. (1959). Meaning and m: Correlated but separate. Psychological Review, 66, 136-144. doi:10.1037/h0047970. [FULLTEXT]