APA

Kolev N., Vassileva C., . (1988). Bulgaria`s olympic champions. : Sofia Press.

Chicago

Kolev Nikolai, Vassileva Christine, . 1988. Bulgaria`s olympic champions. : Sofia Press.

Harvard

Kolev N., Vassileva C., . (1988). Bulgaria`s olympic champions. : Sofia Press.

MLA

Kolev Nikolai, Vassileva Christine, . Bulgaria`s olympic champions. : Sofia Press. 1988.