Siti Rozakiyah Assurin Hassan, Noor Rafidah Md Osman, and Dina Izzati Hashim. 2019. “Dry Drilling: Feasibility of Aluminium Alloy Stack Material in Aerospace Structures”. Politeknik & Kolej Komuniti Journal of Engineering and Technology 4 (1). Putrajaya, Malaysia:42-53. https://app.mypolycc.edu.my/journal/index.php/PMJET/article/view/243.