Sulistio, Suheri Pransisco, and A Mahendra. “Pengaruh Kualitas Produk Terhadap Loyalitas Pelanggan Di Brayan Vegetarian Cemara Asri, Medan”. BISMA Cendekia, vol. 2, no. 1, Sept. 2021, pp. 54-58, https://ojs.politeknikcendana.ac.id/index.php/bisma/article/view/62.