Holtz, R. D., Kovacs, W. D., & Sheahan, T. C. An introduction to geotechnical engineering (2a ed.).
Lua i Stíl Chicago (17ú heag.)Holtz, Robert D., William D. Kovacs, agus Thomas C. Sheahan. An Introduction to Geotechnical Engineering. 2a ed.
Lua MLA (8ú heag.)Holtz, Robert D., et al. An Introduction to Geotechnical Engineering. 2a ed.
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