Cacayorin, Ryan, Lister Almodiel, Renz Louie Angara, John Kevin Bulosan, Mark Erwin Pajarillo, and Riando D. Mosqueda, Ph.D. CRIM. 2019. “The Effectiveness of Checkpoint Conducted by the Philippine National Police at Batasan Hills During Campaign Period”. Ascendens Asia Singapore – Bestlink College of the Philippines Journal of Multidisciplinary Research 1 (1). https://ojs.aaresearchindex.com/index.php/aasgbcpjmra/article/view/1542.