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Rosyatil Hamdani, NIM.: 17108040002 (2021) DAMPAK PANDEMI COVID-19 TERHADAP ABNORMAL RETURN, TRADING VOLUME ACTIVITY DAN SECURITY RETURN VARIABILITY (STUDI KASUS: INDEX SAHAM SYARIAH PADA BURSA EFEK INDONESIA). Skripsi thesis, UIN SUNAN KALIJAGA YOGYAKARTA.