E. Elwindra, A. Agustina, and A. F. 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”, J. Persada Husada Indones., vol. 4, no. 13, pp. 9–18, Apr. 2017.