Opona, Abegail Joyce, et al. “Use of Multiple Representations in Online General Chemistry Class: Promoting Chemical Understanding During the Covid-19 Pandemic”. KIMIKA: The Journal of the Kapisanang Kimika Ng Pilipinas, vol. 33, no. 2, Nov. 2022, pp. 21-33, doi:10.26534/kimika.v33i2.21-33.