Nalom Siagian. “BUSINESS STRATEGY IN THE ERA OF DISRUPTIVE INNOVATION (DIGITAL ECONOMY)”. International Conference on Health Science, Green Economics, Educational Review and Technology 1, no. 1 (December 31, 2019): 197–204. Accessed January 7, 2025. http://proceeding.unefaconference.org/index.php/IHERT/article/view/345.