Gomes, Beatrix Chatarina Da, Aline Theresia Girsang, and Elisabet L Simbolon. “Pengaruh Lingkungan Pergaulan Terhadap Motivasi Belajar Mahasiswa Jurusan Matematika Angkatan 2025 Universitas Negeri Medan”. QISTINA: Jurnal Multidisiplin Indonesia 5, no. 1 (June 12, 2026): 914–922. Accessed June 18, 2026. https://rayyanjurnal.com/index.php/qistina/article/view/8622.