एपीए उद्धरण

Bell, F. G. (2007). Basic enviornmental and engineering geology. Whittles Publishing.

शिकागो स्टाइल उद्धरण

Bell, F G. Basic Enviornmental and Engineering Geology. U. K: Whittles Publishing, 2007.

एमएलए उद्धरण

Bell, F G. Basic Enviornmental and Engineering Geology. Whittles Publishing, 2007.