Zartiga, Joel, and Ulrico Mustacisa. 2022. “Mungkahing Sanayang Pansarili Sa Heograpiya, Kasaysayan at Sibika (Hekasi)”. SSU - Digital Archive for Theses and Dissertations 12 (1). https://datd.ssu.edu.ph/index.php/datd/article/view/191.