Bonvillian, J. D., & Nelson-Metlay, V. (2020). Simplified signs: A manual sign-communication system for special populations. OpenBook Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBonvillian, John D., और Val Nelson-Metlay. Simplified Signs: A Manual Sign-communication System for Special Populations. Cambridge, England: OpenBook Publishers, 2020.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBonvillian, John D., और Val Nelson-Metlay. Simplified Signs: A Manual Sign-communication System for Special Populations. OpenBook Publishers, 2020.
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