The existence of natural signed languages: Lessons in the nature of human language and its biological foundations
Petitto, L. (1997, Novembre). Eistono linguaggi naturali dei segni. KOS. 146. 22-28.
The existence of natural signed languages: Lessons in the nature of human language and its biological foundations. KOS Rivista di medicina, cultura e scienze umane (similar to Scientific American), 146, 22-29.
