Chapitoline GG. Pengaruh Standar Operasional Prosedur (SOP) terhadap Kualitas Pelayanan Kafe Fifty Fifty Jember. JBMWS [Internet]. 30 Agustus 2024 [dikutip 19 September 2024];3(03):291-304. Tersedia pada: https://wnj.westscience-press.com/index.php/jbmws/article/view/1472