W. Su Emi Yusnita Wan Yusof, O. Zakaria, and Z. Zainol, “Developing User Requirement’s Handbook for Malaysian Military Observers Using Phenomenology Approach”, IJET, vol. 7, no. 4.29, pp. 224–227, Nov. 2018, doi: 10.14419/ijet.v7i4.29.26259.