M. S. Harahap, A. Alchalidi, B. Baharuddin, and N. Ramli, “The Effect of Peer Tutor Model on Antenatal Care Skill Competencies in Learning Laboratory Skills for Students of Langsa Midwifery Study Program”, Open Access Maced J Med Sci, vol. 9, no. E, pp. 481–484, Jun. 2021.