MUKTI, Bayu Hari; MAHDIYAH, Dede. Research classification: Principles and applications for health research. Health Sciences International Journal, [S. l.], v. 4, n. 1, p. 1–22, 2026. DOI: 10.71357/hsij.v4i1.87. Disponível em: https://hsij.anandafound.com/journal/article/view/87. Acesso em: 3 feb. 2026.