Style de citation APA (7e éd.)

Não informado. (1977). Coal Abstracts. IEA Coal Research.

Style de citation Chicago (17e éd.)

Não informado. Coal Abstracts. London: IEA Coal Research, 1977.

Style de citation MLA (8e éd.)

Não informado. Coal Abstracts. IEA Coal Research, 1977.

Attention : ces citations peuvent ne pas être correctes à 100%.