Widya-Hastuti, A., N. B. A. Talib, K. Y. Wong, and A. Mardani. “The Role of Intrapreneurship for Sustainable Innovation through Process Innovation in Small and Medium-Sized Enterprises: A Conceptual Framework”. International Journal of Economics and Financial Issues, vol. 6, no. 3S, June 2016, pp. 83-91, https://www.econjournals.com/index.php/ijefi/article/view/2615.