1. Alle, V., (2002). The Future of Knowledge, Butterworth-Heinemann, Boston;
2. Aronson, E., Wilson, T.D. & Akert, A.M., (2007). Social Psychology, 6th Ed. Upper Saddle River, NJ, Pearson Prentice Hall;
3. Bastida, R., Marimon, F. & Carreras, L., (2017). Human Resource Management Practices and Employee Job Satisfaction in Nonprofit Organizations: HRM Practices and Employee Job Satisfaction in Nonprofits, Annals of Public and Cooperative Economics, 89(2), DOI:10.1111/apce.12181;
4. Bulmer, D. & DiMauro, V., (2011). 2nd Annual New Symbiosis of Professional Networks study, Available at: http://dssresources.com/news/325 5.php accesed 12,4.2022;
5. Chu, K., (2015). Vocational education and traning in Germany, Berlin, Institute of Vocational Education;