M R Bustam. “Interpersonal Meaning of Systemic Functional Multimodal Discourse Analysis on World Immunization Week 2021 Posters Related to Covid-19 Issue”. Proceeding of International Conference on Business, Economics, Social Sciences, and Humanities 4 (March 10, 2023): 474–483. Accessed December 8, 2025. https://proceedings.unikom.ac.id/index.php/icobest/article/view/308.