APA-viite (7. p.)
Bonvillian, J. D., & Nelson-Metlay, V. (2020). Simplified signs: A manual sign-communication system for special populations. Open Book Publishers.
Chicago-viite (17. p.)
Bonvillian, John D., ja Val Nelson-Metlay. Simplified Signs: A Manual Sign-communication System for Special Populations. Cambridge, England: Open Book Publishers, 2020.
MLA-viite (9. p.)
Bonvillian, John D., ja Val Nelson-Metlay. Simplified Signs: A Manual Sign-communication System for Special Populations. Open Book Publishers, 2020.
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