Situmeang, R.R., Antoni, A., Patricia, J. and Reinaldo, D. 2020. The Influence of Service Quality, Distribution Channels, and Promotion on Sales Volume at PT Delta Agro Makmur Medan. Jurnal Mantik. 4, 2 (Aug. 2020), 1356-1360. DOI:https://doi.org/10.35335/mantik.Vol4.2020.950.pp1356-1360.