Ианева М, Цонев Н, Василева М, Басмаджиева С. Enhancement of Competitiveness of the Product in the Tourist Business by Health Tourism Marketing Management. НТ. 2018;(2):89-108. отворен на Юли 22, 2026. https://bjiep.e-dnrs.org/index.php/rp/article/view/5569