APA

Transportation Research Board. Special report nr 171, . (1977). Tunnel construction. State of the art and research needs. Washington DC: Transportation Research Board. Special report nr 171.

Chicago

Transportation Research Board. Special report nr 171, . 1977. Tunnel construction. State of the art and research needs. Washington DC: Transportation Research Board. Special report nr 171.

Harvard

Transportation Research Board. Special report nr 171, . (1977). Tunnel construction. State of the art and research needs. Washington DC: Transportation Research Board. Special report nr 171.

MLA

Transportation Research Board. Special report nr 171, . Tunnel construction. State of the art and research needs. Washington DC: Transportation Research Board. Special report nr 171. 1977.