Siti Norhafiza Mohd Khazaai, Nurul Aina Nasriqah Ma’arof, Nurul Hajar Embong, Mohd Hasbi Ab. Rahim, and Gaanty Pragas Maniam. “Mixed domestic-waste catalysts for methyl ester production of soybean oil”. Maejo International Journal of Energy and Environmental Communication, vol. 1, no. 2, May 2019, pp. 1-6, doi:10.54279/mijeec.v1i2.244908.