1. Blagoycheva H (2019) Employers’ social responsibility in the context of digitization. In: Bulgarian–Chinese forum International cluster policies: a collection of papers from an international conference 2018. Science and Economics, University of Economics–Varna, Varna, pp 94–111
2. Andreeva A, Yolova G, Blagoycheva H, Aleksandrov A, Banov H, Yordanov Z (2020) Protection of individual labor rights (of the worker and employee). Science and Economics, Varna (in Bulgarian)
3. European Parliament, https://www.europarl.europa.eu/doceo/document/TA-9-2021-0021_BG.html; WHO, https://www.euro.who.int/en/home