NenengSusanti, Muhammad Ridhwan, SakinaIchsani, Mohammad Nugraha. COMPARATIVE ANALYSIS OF AVERAGE ABNORMAL RETURN, AVERAGE TRADING VOLUME ACTIVITY AND AVERAGE BID-ASK SPREAD BEFORE AND AFTER COVID-19 ANNOUNCEMENT IN INDONESIA (EVENT STUDY ON IDXHIDIV20 INDEX). J Arch.Egyptol [Internet]. 2021Jan.11 [cited 2024May2];17(10):2946-59. Available from: https://archives.palarch.nl/index.php/jae/article/view/5430