APA (7e ed.) Bronvermelding

Não informado. (1972). Abstracts of Bulgarian Scientific Literature. Center for Scientific, Technical and Economic Information.

Chicago (17e ed.) Bronvermelding

Não informado. Abstracts of Bulgarian Scientific Literature. Sofia: Center for Scientific, Technical and Economic Information, 1972.

MLA (8e ed.) Bronvermelding

Não informado. Abstracts of Bulgarian Scientific Literature. Center for Scientific, Technical and Economic Information, 1972.

Let op: Deze citaties zijn niet altijd 100% accuraat.