Jenny Ick, F., and L. T. Tarigan. “THE THE COMPARISON OF ALTMAN Z-SCORE MODEL, ZMIJEWSKI MODEL, SPRINGATE MODEL,: GROVER MODEL, TO PREDICT BANKRUPTCY MINING COMPANY IN BEI”. Fundamental Management Journal, Vol. 3, no. 1, June 2018, pp. 44 -53, http://ejournal.uki.ac.id/index.php/jm/article/view/720.