Staykov, Ivaylo. “The Development of The Labour Law of the European Union in 2019 – New Sources and New Perspectives for a More Reliable Legal Framework of Labour Relations. Part One: European Labour Authority – Establishment and Legal Characteristic”. Yearbook of the Law Department 9, no. 10 (December 30, 2020): 198–241. Accessed September 26, 2022. https://ojs.nbu.bg/index.php/YLD/article/view/643.