?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=Refki+Effendi%2C+1923011004&rft.aulast=Refki+Effendi&rft.aufirst=1923011004&rft.degree=Masters&rft.date=2021&rft.title=ANALISIS+DAMPAK+COVID-19+TERHADAP+ABNORMAL+RETURN+DAN+TRADING+VOLUME+ACTIVITY+(STUDI+PADA+PERUSAHAAN+YANG+TERDAFTAR+DI+BEI+SUB+SEKTOR+PARIWISATA%2C+HOTEL+%26+RESTORAN)&rft.inst=Universitas+Lampung