Mulyantina, Pratiwi. “The Influence of Online and Offline Strategic Marketing Communication to Purchase Intention of Singapore Airlines ”. CoverAge: Journal of Strategic Communication 9, no. 2 (March 18, 2019): 1-10. Accessed August 8, 2020. http://journal.univpancasila.ac.id/index.php/coverage/article/view/1036.