Shamara, I., and K. Azarova. “Current State, Problems and Prospects of the Development of the Ukraine’s Tourism Service Market”. The Journal of V. N. Karazin Kharkiv National University. Series: International Relations. Economics. Country Studies. Tourism, no. 8, Feb. 2019, pp. 196-03, doi:10.26565/2310-9513-2018-8-23.