Anshori, Mohamad Yusak. “Improving The Restaurant Product Sale: A Case Study at a Hotel in Surabaya”. International Research Journal of Business Studies 5, no. 3 (December 1, 2012): 64–73. Accessed December 4, 2025. https://irjbs.prasetiyamulya.ac.id/index.php/jurnalirjbs/article/view/815.