Elwindra, E., A. Agustina, and A. Umar. “Effectiveness of Counseling Using Slide Shows And Video Clips on Narcotics Towards The Knowledge and Attitude of Grade 9 Students of SMPN 1 Kaur District”. Jurnal Persada Husada Indonesia, Vol. 4, no. 13, Apr. 2017, pp. 9-18, doi:10.56014/jphi.v4i13.175.