HASNI, K.; NABI, A.; VARMAN, M.; ILHAM, Z. Preparation of Biodiesel from Hibiscus sabdariffa Seeds Oil using Calcium Oxide Catalyst from Waste Egg Shells. Journal of the Society of Automotive Engineers Malaysia, Kuala Lumpur, Malaysia, v. 2, n. 2, p. 177–183, 2021. DOI: 10.56381/jsaem.v2i2.83. Disponível em: http://jsaem.my/index.php/journal/article/view/83. Acesso em: 31 jan. 2025.