Suwignyo, Hari, and Eko Nusantoro. “Pengaruh Layanan Bimbingan Kelompok Terhadap Kedisiplinan Belajar Pada Siswa Kelas VIII D”. Indonesian Journal of Guidance and Counseling: Theory and Application 4, no. 3 (September 9, 2015). Accessed May 9, 2024. https://journal.unnes.ac.id/sju/jbk/article/view/7563.