Purba, P. Y., C. Riawin, R. Wijaya, W. Suryani, and W. Andreas. “The Influence of Product Quality, Price, and Personal Selling on Purchasing Decisions of Loyal Brands at PT Kawi Agung Kencana: The Influence of Product Quality, Price, and Personal Selling on Purchasing Decisions of Loyal Brands at PT Kawi Agung Kencana”. Jurnal Mantik, vol. 4, no. 2, Aug. 2020, pp. 1217-21, doi:10.35335/mantik.Vol4.2020.888.pp1217-1221.