Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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