Sinaga, L. and Evi, T. (2019) “Perception Analysis and Consumer Behaviour on Purchasing Shell Helix Lubricate Oil Product by Pt. Tira Wira Usaha”, British Journal of Marketing Studies, 7(4), pp. 59-75. Available at: https://bjmsjournal.org/index.php/bjms/article/view/256 (Accessed: 28April2025).