Braun, W. (1978). Tunnelling in soft ground: Ground engineering review. Highlights of the Ninth International Conference on Soil Mechanics and Foundation Engineering, information from the specialty session no.1 in Tokyo. W.M. Braun in cooperation with Deutsche Gesellschaft fuer Erd- und Grundbau and Foundation Publications.
Cita Chicago (17th ed.)Braun, Willi. Tunnelling in Soft Ground: Ground Engineering Review. Highlights of the Ninth International Conference on Soil Mechanics and Foundation Engineering, Information from the Specialty Session No.1 in Tokyo. London: W.M. Braun in cooperation with Deutsche Gesellschaft fuer Erd- und Grundbau and Foundation Publications, 1978.
Cita MLA (8th ed.)Braun, Willi. Tunnelling in Soft Ground: Ground Engineering Review. Highlights of the Ninth International Conference on Soil Mechanics and Foundation Engineering, Information from the Specialty Session No.1 in Tokyo. W.M. Braun in cooperation with Deutsche Gesellschaft fuer Erd- und Grundbau and Foundation Publications, 1978.