SGEM 2017. medzinárodná multidisciplinárna konferencia. SGEM 2017 : 4th international multidisciplinary scientific conference on social sciences and arts, Vienna 28-31 March, 2017 : modern science. vol. 1. Political sciences, law, finance, international relations. 1. vyd. Sofia : STEF92, 2017. 1041 s. ISBN 978-619-7105-93-3.