Ishak, A., E. Mohamad, L. Sukarma, A. R. Mahmood, M. A Rahman, S. Yahya, M. Salleh, and M. Sulaiman. “Cleaner Production Implementation Using Extended Value Stream Mapping for Enhancing the Sustainability of Lean Manufacturing”. Journal of Advanced Manufacturing Technology (JAMT), Vol. 11, no. 1(1), Oct. 2017, pp. 47-60, https://jamt.utem.edu.my/jamt/article/view/2828.