Sholihat, W. (2020). THE INFLUENCE OF SALES VOLUME AND OPERATING COSTS ON PROFIT AT PT. SINAR REKSA KENCANA (SRK) RAKIT KULIM DISTRICT, INDRAGIRI HULU REGENCY. Journal of Industrial Engineering & Management Research, 1(1b), 219-231. https://doi.org/10.7777/jiemar.v1i1b.330