APA (7e ed.) Bronvermelding

Não informado. (1999). Bulletin of the Czech Geological Survey. Czech Geological Survey.

Chicago (17e ed.) Bronvermelding

Não informado. Bulletin of the Czech Geological Survey. Praha: Czech Geological Survey, 1999.

MLA (8e ed.) Bronvermelding

Não informado. Bulletin of the Czech Geological Survey. Czech Geological Survey, 1999.

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