Maclay, H., & Osgood, C. E. (1959). Hesitation phenomena in spontaneous English speech. Word, 15, 19-44. doi:10.1080/00437956.1959.11659682. [FULLTEXT]
A History of Psycholinguistics
Bibliography for Levelt (2013)

Maclay, H., & Osgood, C. E. (1959). Hesitation phenomena in spontaneous English speech. Word, 15, 19-44. doi:10.1080/00437956.1959.11659682. [FULLTEXT]