Dyankov, Todor Konstantinov, Todorova, Yuliana Todorova Opportunities for Market Repositioning of Divergent Eco-Tourist Products in a Dynamic External Environment,
Съюз на учените - Варна, 2019, pp. 111 - 118, ISSN 1314-7390 (рrint) ; 2603-4085 (online).