Azhar S, Shamsul, Nirmal K, Nazarudin S, Rohaizat H, Azimatun Noor A, and Rozita H. “Factors Influencing Childhood Immunization Defaulters in Sabah, Malaysia”. IIUM Medical Journal Malaysia 11, no. 1 (June 1, 2012). Accessed April 19, 2024. https://journals.iium.edu.my/kom/index.php/imjm/article/view/541.