Golser, J., Hinkel, W. J., & Schubert, W. (1997). Tunnels for people =: Tunnel fur Menschen : world tunnel congress '97, Vienna, Austria, proceedings. Rotterdam: A. A. Balkema.
Παραπομπή Chicago StyleGolser, Johann, Walter J. Hinkel, and Wulf Schubert. Tunnels for People =: Tunnel Fur Menschen : World Tunnel Congress '97, Vienna, Austria, Proceedings. Rotterdam: A. A. Balkema, 1997.
Παραπομπή MLAGolser, Johann, Walter J. Hinkel, and Wulf Schubert. Tunnels for People =: Tunnel Fur Menschen : World Tunnel Congress '97, Vienna, Austria, Proceedings. Rotterdam: A. A. Balkema, 1997.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.