Ume, A. C., W. A. Areros, and V. Tatimu. “Promosi Dan Harga Terhadap Keputusan Pembelian Sepeda Motor Yamaha R15 Pada PT. Hasjrat Abadi”. Productivity, vol. 1, no. 2, July 2020, pp. 128-33, https://ejournal.unsrat.ac.id/v3/index.php/productivity/article/view/28984.