APA (7e ed.) Bronvermelding

Não informado. (1970). Geodex Retrieval System for Geotechnical Abstracts. Geodex International.

Chicago (17e ed.) Bronvermelding

Não informado. Geodex Retrieval System for Geotechnical Abstracts. Sonoma, Calif: Geodex International, 1970.

MLA (8e ed.) Bronvermelding

Não informado. Geodex Retrieval System for Geotechnical Abstracts. Geodex International, 1970.

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