Faroerzy, Nik Nurul Izzah Binti, and Nor Faizah Binti Razali. “Antioxidant Activity of Black Tea and Oolong Tea Extracts as Natural Preservatives in Homemade Cookies”. Progress in Engineering Application and Technology, vol. 7, no. 1, May 2026, pp. 536-48, https://publisher.uthm.edu.my/periodicals/index.php/peat/article/view/22585.