Mohd Sopian, Mastura, Sharifah Tuan Din, and Hasmah Hussin. “Obstacles to Implementing the HPV Vaccine: Is It Worth Pursuing or Not?”. Asian Pacific Journal of Cancer Care 4, no. 4 (August 24, 2019): 165-169. Accessed October 24, 2021. http://waocp.com/journal/index.php/apjcc/article/view/298.