Butterworth, R. R., & Flodin, M. (1989). Signing made easy: A complete program for learning sign language, includes sentence drills and exercises for increased comprehension and signing skill. Putnam.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रButterworth, Rod R., और Mickey Flodin. Signing Made Easy: A Complete Program for Learning Sign Language, Includes Sentence Drills and Exercises for Increased Comprehension and Signing Skill. New York: Putnam, 1989.
एमएलए (9वां संस्करण) प्रशस्ति पत्रButterworth, Rod R., और Mickey Flodin. Signing Made Easy: A Complete Program for Learning Sign Language, Includes Sentence Drills and Exercises for Increased Comprehension and Signing Skill. Putnam, 1989.
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