HarminiH., EvvyernieD., KartiP. D. M. H., and WidiawatiY. “Evaluation of Mineral Contents in Milk of Dairy Cattle Fed Elephant Grass Planted at Ex-Coal Mining Land”. Tropical Animal Science Journal, Vol. 43, no. 4, Dec. 2020, pp. 322-30, doi:10.5398/tasj.2020.43.4.322.