Zain, Z. P., A. Efendi, and A. Satrianti. “Peran Wujud, Jaminan & Empati Terhadap Pelanggan Pada SPBU Di Sungguminasa”. Study of Scientific and Behavioral Management (SSBM), Vol. 1, no. 3, Dec. 2020, https://journal3.uin-alauddin.ac.id/index.php/ssbm/article/view/18240.