Cita APA

Estados Unidos. Federal Railroad Administration, & Estados Unidos. Federal Railroad Administration. (1980). Railroad freight traffic flows 1990. Washington: The Federation.

Citación estilo Chicago

Estados Unidos. Federal Railroad Administration, y Estados Unidos. Federal Railroad Administration. Railroad Freight Traffic Flows 1990. Washington: The Federation, 1980.

Cita MLA

Estados Unidos. Federal Railroad Administration, y Estados Unidos. Federal Railroad Administration. Railroad Freight Traffic Flows 1990. Washington: The Federation, 1980.