Bell, F. G. (2007). Engineering geology (2nd ed.). Butterworth-Heinemann.
Chicago-čujuhus (17. p.)Bell, F. G. Engineering Geology. 2nd ed. Oxford ; Boston: Butterworth-Heinemann, 2007.
MLA-čujuhus (9. p.)Bell, F. G. Engineering Geology. 2nd ed. Butterworth-Heinemann, 2007.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.