Purwadi, D., and 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), Vol. 4, no. 3, Nov. 2020, pp. 1607-29, doi:10.31955/mea.v4i3.580.