Levelt, Willem J. M. Language Production Group Levelt, MPI for Psycholinguistics, Max Planck Society;
levelt_Timing_in_Speech_Produc_Annals_New_York_Acad_Sciences_1996.pdf (Publisher version), 662KB
Levelt, W. J. M. (1993). Timing in speech production with special reference to word form encoding. Annals of the New York Academy of Sciences, 682, 283-295. doi:10.1111/j.1749-6632.1993.tb22976.x.