Vural, A., and T. Unlu. “The Geology and Mineralogical / Petrographic Features of Umurbabadag and Its Surroundings (Esme, Usak-Turkey)”. Journal of Engineering Research and Applied Science, Vol. 9, no. 2, Dec. 2020, pp. 1561-87, https://journaleras.com/index.php/jeras/article/view/219.