Jusoh, Normah, and Niza Anira Mohd Zanani. “The Effects of Different Doses of Caffeine on Attention and Cognitive Reaction Time Among Universiti Pendidikan Sultan Idris (UPSI) Students”. Journal of Science and Mathematics Letters 4 (December 1, 2016): 56–62. Accessed March 28, 2024. https://ejournal.upsi.edu.my/index.php/JSML/article/view/423.