Dratistiana, Luita Yusniawati. 2018. “The Importance of How to Have A Successful Negotiation in Business”. Swara Patra : Majalah Ilmiah PPSDM Migas 8 (1):48-56. http://ejurnal.ppsdmmigas.esdm.go.id/sp/index.php/swarapatra/article/view/15.