Bonvillian, J. D., & Nelson-Metlay, V. (2020). Simplified signs: A manual sign-communication system for special populations. OpenBook Publishers.
Lua i Stíl Chicago (17ú heag.)Bonvillian, John D., agus Val Nelson-Metlay. Simplified Signs: A Manual Sign-communication System for Special Populations. Cambridge, England: OpenBook Publishers, 2020.
Lua MLA (9ú heag.)Bonvillian, John D., agus Val Nelson-Metlay. Simplified Signs: A Manual Sign-communication System for Special Populations. OpenBook Publishers, 2020.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.