Ianeva, Mariana, in Ralitsa Georgieva. „Pregled pogojev za poslovni turizem v Bolgariji“. Mednarodno inovativno poslovanje = Journal of Innovative Business and Management 12, no. 1 (junij 30, 2020): 35–40. Pridobljeno september 10, 2026. https://journal.doba.si/jimb/article/view/2020-12-1-5.