NORDSCI 2019. International Conference on Social Sciences. NORDSCI 2019: International Conference on Social Sciences : Proceedings of the International Scientific Conference, 19-23 August 2019, NOVOTEL, (Athens, Greece). Book 2/ Vol. 2,. 1st Edition. Sofia : Saima Consult, 2019. [475 s.]. Dostupné na : <www.nordsci.org> ISBN 978-619-7495-06-5. ISSN 2603-4107.