Bulgarian academy of sciences Scientific information centre. (1983). 1300th anniversay of the foundation of the bulgarian state: Thematic collection.
Цитирование в стиле Чикаго (17-е изд.)Bulgarian academy of sciences Scientific information centre. 1300th Anniversay of the Foundation of the Bulgarian State: Thematic Collection. Sofia, 1983.
Цитирование MLA (8-е изд.)Bulgarian academy of sciences Scientific information centre. 1300th Anniversay of the Foundation of the Bulgarian State: Thematic Collection. 1983.
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