Kurniawan, Erwin Ramdhanu, dan Sawarni Hasibuan. “PERANCANGAN COLLABORATIVE PLANNING FORECASTING REPLENISHMENT ‘TRAVEL BAG’ PADA TRAVEL AGENT DWIDAYA TOUR”. Operations Excellence: Journal of Applied Industrial Engineering, vol. 9, no. 2, Juli 2018, hlm. 91-103, https://publikasi.mercubuana.ac.id/index.php/oe/article/view/3217.