Elshani, Arsim, Kastriot Pehlivani, and Nexhdet Shala. 2016. “The Use of Oxygen in Amounts of 6 and 8 Mg/L in the Main Fermentation of Beer”. ANGLISTICUM. Journal of the Association-Institute for English Language and American Studies 3 (5):127-31. https://www.anglisticum.org.mk/index.php/IJLLIS/article/view/601.