APA (7th ed.) Citation
HARPER, D., & ET AL. (1989). PSYCHOTROPIC DRUG USE IN OLDER DEVELOPMENTALLY DISABLED WITH BEHAVIORAL DIFFICULTIES.
Chicago Style (17th ed.) Citation
HARPER, D.C, and ET AL. PSYCHOTROPIC DRUG USE IN OLDER DEVELOPMENTALLY DISABLED WITH BEHAVIORAL DIFFICULTIES. 1989.
MLA (9th ed.) Citation
HARPER, D.C, and ET AL. PSYCHOTROPIC DRUG USE IN OLDER DEVELOPMENTALLY DISABLED WITH BEHAVIORAL DIFFICULTIES. 1989.
Warning: These citations may not always be 100% accurate.