Purwanto, Edi, and Agnes Debora Bernice Purwanto. “An Investigative Study on Sustainable Competitive Advantage of Manufacture Companies in Indonesia”. Business: Theory and Practice 21, no. 2 (October 5, 2020): 633-642. Accessed April 18, 2024. https://journals.vilniustech.lt/index.php/BTP/article/view/12256.