Kamberi, M., and K. Sulaj. “Levels of Oxytetracycline Residues in Cow’s Milk Collected in Tetovo, Macedonia From 2013-2014”. ANGLISTICUM. Journal of the Association-Institute for English Language and American Studies, vol. 3, no. 8, Dec. 2015, pp. 109-12, https://www.anglisticum.org.mk/index.php/IJLLIS/article/view/305.