Ahmad Fathoni. 2020. “Ketangguhan Warkop Dibandingkan Kafe Di Tengah Hantaman Badai Pandemi Covid-19 Di Surabaya Utara”. Dinar : Jurnal Prodi Ekonomi Syariah 4 (1), 149-76. https://e-jurnal.stail.id/index.php/dinar/article/view/231.