APA (7th ed.) Citation
GIBSON, D., & ET AL. (1989). AGE AND PATTERN OF INTELLECTUAL DECLINE AMONG DOWN SYNDROME AND OTHER MENTALLY RETARDED ADULTS.
Chicago Style (17th ed.) Citation
GIBSON, D., and ET AL. AGE AND PATTERN OF INTELLECTUAL DECLINE AMONG DOWN SYNDROME AND OTHER MENTALLY RETARDED ADULTS. 1989.
MLA (9th ed.) Citation
GIBSON, D., and ET AL. AGE AND PATTERN OF INTELLECTUAL DECLINE AMONG DOWN SYNDROME AND OTHER MENTALLY RETARDED ADULTS. 1989.
Warning: These citations may not always be 100% accurate.