Andrian Fatmawijaya, H., S. Sugiyo, and E. Purwanto. “The Effectiveness of Trisula Motivation Model-Based Classroom Guidance to Improve Students’ Self-Directed Learning”. Jurnal Bimbingan Konseling, Vol. 9, no. 2, Apr. 2020, pp. 98-02, doi:10.15294/jubk.v9i2.37021.