F. Ferdian, S. Stefie, and J. Januardi, “The Effect of Product Quality, Personal Sales and Prices on CPO Purchasing Decisions at PT Kencana Persada Nusantara Medan: The Effect of Product Quality, Personal Sales and Prices on CPO Purchasing Decisions at PT Kencana Persada Nusantara Medan”, Mantik, vol. 3, no. 4, pp. 112-119, Feb. 2020.