PURWADI, D.; ., K. COMPARATIVE ANALYSIS OF ABNORMAL RETURN AND BID-ASK SPREAD BEFORE AND AFTER THE IMPLEMENTATION OF THE 2019 PRESIDENTIAL SELECTION. Jurnal Ilmiah Manajemen, Ekonomi, & Akuntansi (MEA), v. 4, n. 3, p. 1607-1629, 28 nov. 2020.