Zahari, B., K. A. Abdul Rahman, M. B. . Rahim, F. A. N. Yunus, and N. . Razali. “Cooling Tower System As Teaching Aids Tools for Vocational College and Air Conditioning Technology Program”. Research and Innovation in Technical and Vocational Education and Training, vol. 1, no. 1, Feb. 2021, pp. 75-81, https://publisher.uthm.edu.my/periodicals/index.php/ritvet/article/view/193.