[Fifth] 5th International Multidisciplinary Scientific Conference on Social Sciences and Arts SGEM 2018: Conference proceedings : Vol. 5 : Business and Management : Modern Science : 24 August - 01 September 2018, Albena, Bulgaria. Sofia: STEF92 Technology Ltd.; 2018. p. XVI, 1232 p. ISBN: 978-619-7408-65-2.