Harianto, Harianto, KusnadiN., and ParamitaD. A. 2019. “The Impact of Vertical Integration Intensity on Broiler Farms Technical Efficiency: The Case of Contract Farming in West Sumatera”. Tropical Animal Science Journal 42 (2), 167-74. https://doi.org/10.5398/tasj.2019.42.2.167.