Bell , F. G. (2007). Engineering geology (2nd ed.). Butterworth Heinemann.
Chicago-čujuhus (17. p.)Bell , F. G. Engineering Geology. 2nd ed. Oxford: 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.