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Lua i Stíl Chicago (17ú heag.)International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground agus Giulia editor Viggiani. Geotechnical Aspects of Underground Construction in Soft Ground: Proceedings of the 7th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, Roma, Italy, 17-19 May, 2011. Leiden, Netherlands : CRC Press/Balkema, 201.
Lua MLA (9ú heag.)International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground agus Giulia editor Viggiani. Geotechnical Aspects of Underground Construction in Soft Ground: Proceedings of the 7th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, Roma, Italy, 17-19 May, 2011. Leiden, Netherlands : CRC Press/Balkema, 201.