Defisah, Afy, Masnurimma Heriansyah, Andi Wahyu Irawan, Dydik Kurniawan, and Yasintha Sari Pratiwi. 2021. “The Contribution of Group Guidance Services to Increasing the Study Concentration of Class X Students at SMA Negeri 3 Samarinda 2020/2021”. Educational Studies: Conference Series 1 (1), 139-44. https://doi.org/10.30872/escs.v1i1.860.