Amanda, B., A. Sutoyo, and E. Nusantoro. “Peningkatan Motivasi Belajar Siswa Kelas VIII Melalui Layanan Bimbingan Kelompok”. Indonesian Journal of Guidance and Counseling: Theory and Application, Vol. 2, no. 4, Aug. 2017, doi:10.15294/ijgc.v2i4.17214.