APA (7th ed.) Citation

Bonvillian, J. D., & Nelson-Metlay, V. (2020). Simplified signs: A manual sign-communication system for special populations. Open Book Publishers.

Chicago Style (17th ed.) Citation

Bonvillian, John D., and Val Nelson-Metlay. Simplified Signs: A Manual Sign-communication System for Special Populations. Cambridge, England: Open Book Publishers, 2020.

MLA (9th ed.) Citation

Bonvillian, John D., and Val Nelson-Metlay. Simplified Signs: A Manual Sign-communication System for Special Populations. Open Book Publishers, 2020.