Bonvillian, J. D., & Nelson-Metlay, V. (2020). Simplified signs: A manual sign-communication system for special populations. Open Book Publishers.
Cita Chicago (17th ed.)Bonvillian, John D., i Val Nelson-Metlay. Simplified Signs: A Manual Sign-communication System for Special Populations. Cambridge, England: Open Book Publishers, 2020.
Cita MLA (9th ed.)Bonvillian, John D., i Val Nelson-Metlay. Simplified Signs: A Manual Sign-communication System for Special Populations. Open Book Publishers, 2020.
Atenció: Aquestes cites poden no estar 100% correctes.