National Research Council (U.S.). Transportation Research Board. Committee on Maintenance and Operations Personnel & American Association of State Highway and Transportation Officials. Subcommittee on Maintenance. (1984). Progress report on maintenance and operations personnel. Transportation Research Board.
Παραπομπή σε μορφή Chicago (17η εκδ.)National Research Council (U.S.). Transportation Research Board. Committee on Maintenance and Operations Personnel και American Association of State Highway and Transportation Officials. Subcommittee on Maintenance. Progress Report on Maintenance and Operations Personnel. Washington, D.C: Transportation Research Board, 1984.
Παραπομπή σε μορφή MLA (9th εκδ.)National Research Council (U.S.). Transportation Research Board. Committee on Maintenance and Operations Personnel και American Association of State Highway and Transportation Officials. Subcommittee on Maintenance. Progress Report on Maintenance and Operations Personnel. Transportation Research Board, 1984.