Saudi, M. H. M., Sinaga, O., Roespinoedji, D. and Razimi, M. S. A. (2019) “Environmental Sustainability in the Fourth Industrial Revolution: The Nexus between Green Product and Green Process Innovation”, International Journal of Energy Economics and Policy, 9(5), pp. 363–370. Available at: https://www.econjournals.com/index.php/ijeep/article/view/8281 (Accessed: 7 December 2022).