Pengaruh Lingkungan Teman Sebaya Terhadap Motivasi Belajar Matematika SiswaDevelopment Research, Teacher Competency, Research, Modified Model - Elinggrawati, Elinggrawati; Rahmat, Tasnim; Aprison, Wedra; Fitri, Haida (Jurnal Ilmiah Wahana Pendidikan, 2023)