Rahmayanti, D., Hadiguna, R. A., Santosa, S., & Nazir, N. (2018). Determining The Profit Margin In “Patchouli Oil” Supply Chain: A Case Study In Indonesia. International Journal on Advanced Science, Engineering and Information Technology, 8(2), 483–488. https://doi.org/10.18517/ijaseit.8.2.3485