Lim B, Sri Aprianti Tarigan, Felix Leonardi. The Influence Product Quality And Promotion Toward Sales Volume at PT. Herbalife Nutrition Club Sisingamangaraja. IJEBIR [Internet]. 2026Aug.11 [cited 2026Nov.4];5(05):922-31. Available from: https://e-journal.citakonsultindo.or.id/index.php/IJEBIR/article/view/5834