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THE INFLUENCE OF PROMOTIONAL COST AGAINTS SALES VOLUME PRODUCT BATIK JAMBI SELARAS PINANG MASAK IN JAMBI CITY. JBSMR [Internet]. 2018Aug.2 [cited 2024Nov.26];1(2):52-5. Available from: https://online-journal.unja.ac.id/jbsmr/article/view/5350