Salvaleon, Rolly G. “A Promise of Change: A Transitivity Analysis of Rodrigo Duterte’s State of the Nation Addresses”. Asia Pacific Higher Education Research Journal (APHERJ) 6, no. 2 (December 22, 2019). Accessed December 4, 2024. https://po.pnuresearchportal.org/ejournal/index.php/apherj/article/view/1395.