Cita APA (7th ed.)
Bell, F. G. (2007). Engineering geology (2nd ed.). Butterworth-Heinemann.
Cita Chicago (17th ed.)
Bell, F. G. Engineering Geology. 2nd ed. Oxford ; Boston: Butterworth-Heinemann, 2007.
Cita MLA (9th ed.)
Bell, F. G. Engineering Geology. 2nd ed. Butterworth-Heinemann, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.