APA (7e ed.) Bronvermelding

Não informado. (1975). Natural Resources and Development. Bundesanstalt fur Geowissenschaften und Rohstoffe.

Chicago (17e ed.) Bronvermelding

Não informado. Natural Resources and Development. Hannover, Alemanha: Bundesanstalt fur Geowissenschaften und Rohstoffe, 1975.

MLA (8e ed.) Bronvermelding

Não informado. Natural Resources and Development. Bundesanstalt fur Geowissenschaften und Rohstoffe, 1975.

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