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 [Internet]. 2019Jul.12 [cited 2024Nov.6];2(2):88-93. Available from: https://online-journal.unja.ac.id/jbsmr/article/view/7221