Skinner, B. F. (1936). The verbal summator and a method for the study of latent speech. Journal of Psychology, 2, 71-107. doi:10.1080/00223980.1936.9917445. [FULLTEXT]
A History of Psycholinguistics
Bibliography for Levelt (2013)

Skinner, B. F. (1936). The verbal summator and a method for the study of latent speech. Journal of Psychology, 2, 71-107. doi:10.1080/00223980.1936.9917445. [FULLTEXT]