Komara, Ade Arief, Bonar M. Sinaga, and Trias Andati. 2019. “The Impact of Changes in External and Internal Factors on Financial Performance and Stock Returns of Coal Companies”. Jurnal Aplikasi Bisnis Dan Manajemen (JABM) 5 (3), 513. https://doi.org/10.17358/jabm.5.3.513.