2018. THE INFLUENCE OF PROMOTIONAL COST AGAINTS SALES VOLUME PRODUCT BATIK JAMBI SELARAS PINANG MASAK IN JAMBI CITY. JOURNAL OF BUSINESS STUDIES AND MANAGEMENT REVIEW. 1, 2 (Aug. 2018), 52–55. DOI:https://doi.org/10.22437/jbsmr.v1i2.5350.