Zulkarnain, N. et al. 2023. MODIFIED SEIRD MODEL: A NOVEL SYSTEM DYNAMICS APPROACH IN MODELLING THE SPREAD OF COVID-19 IN MALAYSIA DURING THE PRE-VACCINATION PERIOD. IIUM Engineering Journal. 24, 2 (Jul. 2023), 159–183. DOI:https://doi.org/10.31436/iiumej.v24i2.2550.