Dratistiana, L. Y. “The Importance of How to Have A Successful Negotiation in Business”. Swara Patra : Majalah Ilmiah PPSDM Migas, vol. 8, no. 1, Mar. 2018, pp. 48-56, http://ejurnal.ppsdmmigas.esdm.go.id/sp/index.php/swarapatra/article/view/15.