Alauddin, Nursuhana, and Solehuddin Shuib. “Systematic Cost Framework by Application of Universal Design (UD) Concept for Operating Instructions in Design Stage”. International Journal of Engineering & Technology, vol. 7, no. 4.18, Nov. 2018, pp. 1-4, https://doi.org/10.14419/ijet.v7i4.18.21809.