Nesti, Lisa, Firwan Tan, Endrizal Ridwan, and Rika Ampuh Hadiguna. “Vertical Integration Market Analysis of Palm Oil Fresh Fruit Bunches in West Sumatera, Indonesia”. International Journal of Engineering and Technology 7, no. 4.9 (October 2, 2018): 250–254. Accessed August 16, 2025. https://mail.sciencepubco.com/index.php/IJET/article/view/21090.