Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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