International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground & Viggiani, G. e. (201). Geotechnical aspects of underground construction in soft ground [electronic resource]: 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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground و Giulia editor Viggiani. Geotechnical Aspects of Underground Construction in Soft Ground [electronic Resource]: 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.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground و Giulia editor Viggiani. Geotechnical Aspects of Underground Construction in Soft Ground [electronic Resource]: 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.