6th International Multidisciplinary Scientific Conferences on Social Sciences and Arts, SGEM 2019,Varna City, Bulgaria, Volume 6, Issue 1, p 155-160. (ISBN: 978-619-7408-91-1), (ISSN: 2682-9959), (DOI: 10.5593/SWS.ISCSS.2019.1)
منفرد
9/2/2019
9/2/2019