APA (7e ed.) Bronvermelding

Não informado. (1971). Environmental data service. Environmental Data Service.

Chicago (17e ed.) Bronvermelding

Não informado. Environmental Data Service. Rockville, Md: Environmental Data Service, 1971.

MLA (8e ed.) Bronvermelding

Não informado. Environmental Data Service. Environmental Data Service, 1971.

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