Bell, F. G. (2007). Engineering geology (2nd ed.). Elsevier.
Lua i Stíl Chicago (17ú heag.)Bell, F. G. Engineering Geology. 2nd ed. Amsterdam: Elsevier, 2007.
Lua MLA (9ú heag.)Bell, F. G. Engineering Geology. 2nd ed. Elsevier, 2007.
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