Não informado. (1968). Abstracts of bulgarian scientific medical literature. Ministry of Public Health, Centre for Scientific Medical Information.
Čikaški stil citiranja (17. izdanje)Não informado. Abstracts of Bulgarian Scientific Medical Literature. Sofia: Ministry of Public Health, Centre for Scientific Medical Information, 1968.
MLA način citiranja (8. izdanje)Não informado. Abstracts of Bulgarian Scientific Medical Literature. Ministry of Public Health, Centre for Scientific Medical Information, 1968.
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