Abdullah , S. N. F. “Kesan Proses Pengoksidaan Daripada Ekstrak Tumbuhan Rosel (Hibiscus Sabdariffa Var. Ukmr-2) Kering Di Bahagian Yang Berbeza”. Politeknik & Kolej Komuniti Journal of Engineering and Technology, vol. 5, no. 1, Nov. 2020, pp. 151-7, https://app.mypolycc.edu.my/journal/index.php/PMJET/article/view/288.