en.wikipedia.org
en.wikipedia.org
bnr.bg
repozytorium.uwb.edu.pl
tandfonline.com
Taylor & Francis Online
https://www.tandfonline.com › doi › pdf › 10.1080 › 09612020000200229
eq-bg.org
tandfonline.com
Taylor & Francis Online
https://www.tandfonline.com › doi › pdf › 10.1080 › 09612020400200384
researchgate.net
researchgate.net
bnr.bg
jstor.org
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