- Author: Willem J. M. Levelt
- Language: English
- Year: 1993
- Author: Willem J. M. Levelt
- Language: English
- Year: 1993
- Author: Willem J. M. Levelt
- Language: English
- Year: 2008
- Author: Willem J. M. Levelt
- Language: English
- Year: 2008
- Author: A. H. M. Levelt
- Language: English
- Year: 1996
- Author: Levelt A.H.M.
- Language: English
- Year: 1961