HUTAJULU, I. P. Universitas Terbuka dan Tantangan Belajar Mandiri. Analisis CSIS, [S. l.], n. 5, p. 412–423, 2023. Disponível em: https://journals.csis.or.id/index.php/analisis/article/view/792. Acesso em: 22 nov. 2024.