APA (7e ed.) Bronvermelding

Não informado. (1954). Year book. International Council of Scientific Unions.

Chicago (17e ed.) Bronvermelding

Não informado. Year Book. Miami, Fla: International Council of Scientific Unions, 1954.

MLA (8e ed.) Bronvermelding

Não informado. Year Book. International Council of Scientific Unions, 1954.

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