Das, B. M. (2007). Principles of geotechnical engineering (6th ed.). Thomson.
Lua i Stíl Chicago (17ú heag.)Das, Braja M. Principles of Geotechnical Engineering. 6th ed. Australia: Thomson, 2007.
Lua MLA (9ú heag.)Das, Braja M. Principles of Geotechnical Engineering. 6th ed. Thomson, 2007.
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