Mohamad, N., A. A. Abdul Samad, M. T. Lakhiar, M. A. Othuman Mydin, S. Jusoh, A. Sofia, and S. A. Efendi. “Effects of Incorporating Banana Skin Powder (BSP) and Palm Oil Fuel Ash (POFA) on Mechanical Properties of Lightweight Foamed Concrete”. International Journal of Integrated Engineering, Vol. 10, no. 9, Jan. 2019, https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/3104.