Cita APA (7a ed.)

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.

Cita Chicago Style (17a ed.)

Butterworth, Rod R., y 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.

Cita MLA (9a ed.)

Butterworth, Rod R., y 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.