Jim Joshua E. Pañares, Jan Glenndale Punsalan, Raul Ramiro Silva, Arvin C. Villanueva, Alma G. Galang and Salvador A. Loria Jr. 2021. The Effectiveness of Online Classes to Engineering Students of Holy Angel University (HAU). International Journal of Progressive Research in Science and Engineering . 2, 12 (Dec. 2021), 31–37.