Pehlivani, Kastriot, Arsim Elshani, and Xheme Lajqi. 2015. “The Role of Oxygen Concentration of 8 and 10 Mg/L in the Main Fermentation of Beer”. ANGLISTICUM. Journal of the Association-Institute for English Language and American Studies 4 (1):109-12. https://anglisticum.org.mk/index.php/IJLLIS/article/view/232.