Laila Fatmala Santi, NIM.: 17108040001 (2021) DAMPAK PANDEMI COVID-19 TERHADAP TRADING VOLUME ACTIVITY, TRADING FREQUENCY ACTIVITY, SECURITY RETURN VARIABILITY, DAN HARGA SAHAM (STUDI KASUS SAHAM LQ-45 BURSA EFEK INDONESIA). Skripsi thesis, UIN SUNAN KALIJAGA YOGYAKARTA.