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THE DIFFERENCE ANALYSIS OF ABNORMAL RETURN AND TRADE VOLUME ACTIVITY BEFORE AND AFTER RAMADHAN EFFECTS ON FOOD AND BEVERAGES COMPANIES LISTED IN INDONESIAN SHARIA STOCK INDEX (ISSI). JBSMR 2019, 2 (2), 88-93. https://doi.org/10.22437/jbsmr.v2i2.7221.