Yunus, Faizal Amin Nur, and Noor Farahanis Zaima Othman. “Functionality of an Air Duct Model As a Teaching Aid”. Research and Innovation in Technical and Vocational Education and Training, vol. 5, no. 2, Dec. 2025, pp. 137-45, https://publisher.uthm.edu.my/periodicals/index.php/ritvet/article/view/15991.