DS Susilowati, Kartika, et al. “Analysis of Contract Farming Partnership for Sustainable Supply of Tobacco (a Case Study on the Integrated Production System Program of PT. HM Sampoerna Tbk. - Indonesia)”. International Journal of Engineering & Technology, vol. 7, no. 4.15, Oct. 2018, pp. 219-23, https://doi.org/10.14419/ijet.v7i4.15.22993.