APA (7e ed.) Bronvermelding

BELL, F. Ground engineer-s reference book. Butterworths.

Chicago (17e ed.) Bronvermelding

BELL, F.G. Ground Engineer-s Reference Book. Butterworths.

MLA (8e ed.) Bronvermelding

BELL, F.G. Ground Engineer-s Reference Book. Butterworths.

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