Hasibuan, Abdurrozzaq, Abdul Rahman Suleman, Istu Sri Poneni, Luthfi Parinduri, and Oris Krianto Sulaiman. “Analysis of Effect of Production Costs and Employment on Sale of Kurma Salak”. International Journal of Engineering & Technology 7, no. 2.9 (March 19, 2018): 56–60. Accessed November 23, 2024. https://sciencepubco.com/index.php/ijet/article/view/13347.