APA (7e ed.) Bronvermelding

Não informado. (1957). Abstracts of Bulgarian Scientific Literature. Centre of Scientific Information and Documentation.

Chicago (17e ed.) Bronvermelding

Não informado. Abstracts of Bulgarian Scientific Literature. Sofia: Centre of Scientific Information and Documentation, 1957.

MLA (8e ed.) Bronvermelding

Não informado. Abstracts of Bulgarian Scientific Literature. Centre of Scientific Information and Documentation, 1957.

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