Bulgarian Academy of Sciences. (1978). Abstracts of Bulgarian Scientific Literature. Scientific Information Centre.
Chicago-referens (17:e uppl.)Bulgarian Academy of Sciences. Abstracts of Bulgarian Scientific Literature. Sofia: Scientific Information Centre, 1978.
MLA-referens (8:e uppl.)Bulgarian Academy of Sciences. Abstracts of Bulgarian Scientific Literature. Scientific Information Centre, 1978.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.