Susanto, Steven Pratama, and Melkyory Andronicus. 2021. “The Influence of Service Quality, Product Quality, and Promotion on Purchase Decision at PT. Unikitz Bersatu Group Medan Branch”. Jurnal Mantik 5 (2):946-52. https://doi.org/10.35335/jurnalmantik.Vol5.2021.1424.pp946-952.