Theses
| Title | Author | Level | Organisation | Year |
|---|
| From sign language to speech: delayed acquisition of English by a hearing child of deaf parents | Todd | PhD | University of California at Berkeley, USA | 1972 |
| The sign language, an analysis (volumes I and II). | West | PhD | Indiana University, USA | 1960 |
| Tervoort | PhD | University of Amsterdam, Netherlands | 1953 |