I. Pateda, Mutiara, Victorina Z. Tirayoh, and Syermi S.E Mintalangi. 2023. “Analysis of Differential Costs of By-Products to Generate Differential Income at PT Pathemaang Raya Bitung”. Formosa Journal of Applied Sciences 2 (10):2383-98. https://doi.org/10.55927/fjas.v2i10.6380.