Cita APA (7a ed.)

Bonvillian, J. D., & Nelson-Metlay, V. (2020). Simplified Signs: Volume 1, Principles, background, and application : a manual sign-communication system for special populations. Open Book Publishers.

Cita Chicago Style (17a ed.)

Bonvillian, John D., y Val Nelson-Metlay. Simplified Signs: Volume 1, Principles, Background, and Application : A Manual Sign-communication System for Special Populations. Cambridge, UK: Open Book Publishers, 2020.

Cita MLA (9a ed.)

Bonvillian, John D., y Val Nelson-Metlay. Simplified Signs: Volume 1, Principles, Background, and Application : A Manual Sign-communication System for Special Populations. Open Book Publishers, 2020.