1.
Sinaga L, Evi T. Perception Analysis and Consumer Behaviour on Purchasing Shell Helix Lubricate Oil Product by Pt. Tira Wira Usaha. bjms [Internet]. 2019Jul.30 [cited 2025Mar.14];7(4):59-5. Available from: https://bjmsjournal.org/index.php/bjms/article/view/256