Prastiwi, S. “Pengaruh Marketing Mix Terhadap Loyalitas Konsumen J&C Cookies Di Surabaya”. Yos Soedarso Economic Journal (YEJ), vol. 1, no. 3, Dec. 2019, pp. 26-34, https://ejurnal.uniyos.ac.id/index.php/ysej-server/article/view/YEJ-1304.