Não informado. (2008). Communications of the Department of Chemistry. Bulgarian Academy of Sciences.
Citação do estilo Chicago (17ª ed.)Não informado. Communications of the Department of Chemistry. Sofia: Bulgarian Academy of Sciences, 2008.
Citação MLA (8ª ed.)Não informado. Communications of the Department of Chemistry. Bulgarian Academy of Sciences, 2008.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.