Não informado. (1962). Abstracts of bulgarian scientific literature. Center for Scientific, Technical and Economic Information.
Chicago-Zitierstil (17. Ausg.)Não informado. Abstracts of Bulgarian Scientific Literature. Sofia: Center for Scientific, Technical and Economic Information, 1962.
MLA-Zitierstil (8. Ausg.)Não informado. Abstracts of Bulgarian Scientific Literature. Center for Scientific, Technical and Economic Information, 1962.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.