Rahmayanti, Dina, Rika Ampuh Hadiguna, Santosa Santosa, and Novizar Nazir. 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):483-88. https://doi.org/10.18517/ijaseit.8.2.3485.