Popov, B. In and Around Varna. Варна: Унив. изд. на ИУ, 2001 82 с. 954-21-0129-5.
Popov, B. In and Around Varna. Варна: Унив. изд. на ИУ, 2001 82 с. 954-21-0129-5.
Popov, B. (2001) In and Around Varna, Варна: Унив. изд. на ИУ 82 с. 954-21-0129-5.
Popov, B. (2001). In and Around Varna. My first Year the College of Tourism : A Manual for English-Speaking Guides a. Students of Tourism : Compiled. Варна: Унив. изд. на ИУ, 82 с.
Popov B. In and Around Varna: My first Year the College of Tourism : A Manual for English-Speaking Guides a. Students of Tourism : Compiled. Варна: Унив. изд. на ИУ; 2001. p. 82 с. ISBN: 954-21-0129-5.