Lina Gazu Mego, et al. “Physicochemical Analysis and Microbial Quality of Cow Butter Obtained from Menz District of Amhara Region, Ethiopia”. International Journal of Livestock Research, vol. 8, no. 11, Nov. 2018, pp. 50-63, http://ijlr.org/ojs_journal/index.php/ijlr/article/view/1489.