National Research Council (U.S.). Transportation Research Board. Committee on Public Transportation Planning and Development. Subcommittee on Definitions & Gray, B. H. (1989). Urban public transportation glossary. Transportation Research Board.
Παραπομπή σε μορφή Chicago (17η εκδ.)National Research Council (U.S.). Transportation Research Board. Committee on Public Transportation Planning and Development. Subcommittee on Definitions και Benita H. Gray. Urban Public Transportation Glossary. Washington, D.C: Transportation Research Board, 1989.
Παραπομπή σε μορφή MLA (9th εκδ.)National Research Council (U.S.). Transportation Research Board. Committee on Public Transportation Planning and Development. Subcommittee on Definitions και Benita H. Gray. Urban Public Transportation Glossary. Transportation Research Board, 1989.