Salsabillah, S., and I. D. Rahmawati. “Analysis of Calculation of Production Costs and Operational Costs Against Sales Results of PT. Indofood Sukses Makmur, Tbk. 2017-2019 Period”. Indonesian Journal of Innovation Studies, Vol. 17, Oct. 2021, p. 10.21070/ijins.v17i.566, doi:10.21070/ijins.v17i.566.