Bohdan, Daryna, Vladyslava Isaienko, and Anna Perepelytsia. 2020. “Research on the Development of Space tourism:Problems and Prospects”. The Journal of V. N. Karazin Kharkiv National University. Series: International Relations. Economics. Country Studies. Tourism, no. 10 (January), 186-92. https://doi.org/10.26565/2310-9513-2019-10-19.