IISES 2019. International Academic Conference. Proceedings of the 52nd International Academic Conference : Barcelona, 23 - 26 September 2019. 1st Edition. Prague : International Institute of Social and Economic Sciences IISES, 2019. [611 s.]. Dostupné na : <https://iises.net/proceedings/international-academic-conference-barcelona/front-page> ISBN 978-80-87927-91-5. ISSN 2336-5617.