S. . Devi and S. Harjatno, “The Role of Prices, Locations, and Promotions on Smartphone Purchase Decisions in Electronics Shop in Indonesia: a Lesson from Sidoarjo: Peran Harga, Lokasi, dan Promosi Terhadap Keputusan Pembelian Smartphone di Toko Elektronik di Indonesia: Pembelajaran dari Sidoarjo”, ijler, vol. 2, no. 2, p. 10.21070/ijler.2019.V2.30, Feb. 2019.