Harahap, Serarifi Elagin, et al. “Fenomena Black Swan: Dampak Covid-19 Terhadap Herding Behavior Pada Sembilan Sektor Di Pasar Modal Indonesia: Black Swan Phenomenon: The Impact of Covid-19 On Herding Behavior in Nine Sectors in The Indonesian Stock Market”. Jurnal Aplikasi Bisnis Dan Manajemen, vol. 9, no. 3, Sept. 2023, p. 998, https://doi.org/10.17358/jabm.9.3.998.