APA (7e ed.) Bronvermelding

Não informado. Quarterly Bulletin of Coal Statistics for Europe. United Nations, Economic Commission for Europe, Coal Division.

Chicago (17e ed.) Bronvermelding

Não informado. Quarterly Bulletin of Coal Statistics for Europe. Geneva, Suíça: United Nations, Economic Commission for Europe, Coal Division.

MLA (8e ed.) Bronvermelding

Não informado. Quarterly Bulletin of Coal Statistics for Europe. United Nations, Economic Commission for Europe, Coal Division.

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