Sarumpaet, T., and A. Suhardi. “INFORMATION ASSYMETRI, LEVERAGE AND EARNINGS MANAGEMENT (EMPIRICAL STUDY ON MINING COMPANIES LISTED AT INDONESIA STOCK EXCHANGE)”. JURNAL ILMIAH BISNIS, PASAR MODAL DAN UMKM, Vol. 2, no. 1, Nov. 2019, pp. 145-9, https://ibn.e-journal.id/index.php/JIBPU/article/view/128.