SAIENKO, Volodymyr, 		MEZENTSEVA, Inna, 		TOLCHIEVA, Hanna, AND 		SALKOVA, Iryna.
" Efficiency of Tourism Operators’ and Tourism Agents’ Activities in the Market of Tourist Services of Ukraine" <em>Journal of Environmental Management and Tourism</em> [Online], Volume 11 Number 8 (3 January 2021)