Bambang Hengky Rainanto, Abdul Talib Bon, Jan Horas V. Purba. “Environmental Variables for Sustainable Industry Performance With the Green Marketing Mix: Preliminary Study”. International Journal of Advanced Science and Technology, Vol. 29, no. 7s, May 2020, pp. 3744-59, http://sersc.org/journals/index.php/IJAST/article/view/17699.