Yulfenti Sayuna, Yeheskial Nggandung, and Agustina Butar-Butar, “Pengaruh Implementasi Model Problem Based Learning Berbasis Audio Visual Terhadap Peningkatan Hasil Belajar Siswa di SMP Negeri 20 Kupang”, atmosfer, vol. 4, no. 2, pp. 01–07, May 2026.