HARSONO, D. Lompatan Kemajuan Ull Dalam Usia Ke-70. Unisia, [S. l.], v. 35, n. 78, p. 34–44, 2015. DOI: 10.20885/unisia.vol35.iss78.art4. Disponível em: https://journal.uii.ac.id/Unisia/article/view/3599. Acesso em: 5 may. 2024.