(1968). International. . Sofija. (Bulgaria).
Chicago Style (17th ed.) CitationInternational. . Sofija. (Bulgaria). 1968.
MLA (8th ed.) CitationInternational. . Sofija. (Bulgaria). 1968.
Warning: These citations may not always be 100% accurate.
(1968). International. . Sofija. (Bulgaria).
Chicago Style (17th ed.) CitationInternational. . Sofija. (Bulgaria). 1968.
MLA (8th ed.) CitationInternational. . Sofija. (Bulgaria). 1968.