APA

European Conference of Ministers of Transport, ECMT, . (1991). Freight transport and the environment. Paris: European Conference of Ministers of Transport.

Chicago

European Conference of Ministers of Transport, ECMT, . 1991. Freight transport and the environment. Paris: European Conference of Ministers of Transport.

Harvard

European Conference of Ministers of Transport, ECMT, . (1991). Freight transport and the environment. Paris: European Conference of Ministers of Transport.

MLA

European Conference of Ministers of Transport, ECMT, . Freight transport and the environment. Paris: European Conference of Ministers of Transport. 1991.