| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Diagnostic Evaluation of Language Variation-Screening Test: Examiner's Manual | 978-0-15-809205-8 (0-15-809205-8) | 2003 | Harry Seymour · Thomas Roeper · Peter De Villiers |
| Handbook of Generative Approaches to Language Acquisition | 978-94-007-1687-2 (94-007-1687-7) | 2011 | Tom Roeper |
de Villiers · J.D. · J. de Villiers · J.V. · J. Villiers