Levelt, Willem J. M. Language Production Group Levelt, MPI for Psycholinguistics, Max Planck Society;
Levelt_The_Ability_to_speak-European_Review_1995.pdf (Publisher version), 2MB
Levelt, W. J. M. (1995). The ability to speak: From intentions to spoken words. European Review, 3(1), 13-23. doi:10.1017/S1062798700001290.