De Jesus, Carlo Adrine B., Dela Cruz, Anna Natalie Y., Reguyal, Ardreen B., Romero, Ericka Patricia D., Nestor R. Ong, “A Study on Traffic Signal System at Lacson- Espaňa Intersection for Optimization ”, IJAST, vol. 29, no. 6s, pp. 1422 - 1428, Apr. 2020.