1. Bimodal code-mixing: Dutch spoken language elements in NGT discourse
2. Battison, R. (1978). Lexical borrowing in American Sign Language. Linstok Press.
3. Formal Devices for Creating New Signs in American Sign Language
4. Boyes Braem, P. (2001). Functions of the mouthings in the signing of deaf early and late learners of Swiss German Sign Language (DSGS). In P. Boyes Braem, & R. Sutton-Spence (Eds.), The hands are the head of the mouth: The mouth as articulator in sign languages (pp. 99–132). Signum-Verlag.
5. Brennan, M. (1990). Word formation in British Sign Language. University of Stockholm.