Ismiyah, E. 2021. Analysis of Operational Risk Management of Broiler Farms Closed House Systems. Journal Universitas Muhammadiyah Gresik Engineering, Social Science, and Health International Conference (UMGESHIC). 1, 2 (Dec. 2021), 712–719. DOI:https://doi.org/10.30587/umgeshic.v1i2.3447.