Siregar, J., and S. Wimbarti. “Screening for the Hyperkinetic Disorder by Using Strength and Difficulties Questionnaire Teacher-Report (SDQ-TR) in Indonesia School-Aged Children”. Global Journal of Psychology Research: New Trends and Issues, vol. 8, no. 2, June 2018, pp. 76-87, doi:10.18844/gjpr.v8i2.3490.