BERESTOK, Alina. FACTORS OF REGIONAL TOURIST MARKET FORMATION IN SUMY REGION AND ITS PLACE IN THE NATIONAL TOURIST MARKET OF UKRAINE. Ekonomichna ta Sotsialna Geografiya, Kyiv, Ukraine, v. 74, p. 3–9, 2015. DOI: 10.17721/2413-7154/2015.74.3-9. Disponível em: https://www.bulletin-esgeograph.org.ua/esg/article/view/74-berestok-3-9. Acesso em: 15 jul. 2026.