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.
Chicago-referens (17:e uppl.)National Research Council (U.S.). Transportation Research Board. Committee on Maintenance and Operations Personnel och 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.
MLA-referens (9:e uppl.)National Research Council (U.S.). Transportation Research Board. Committee on Maintenance and Operations Personnel och American Association of State Highway and Transportation Officials. Subcommittee on Maintenance. Progress Report on Maintenance and Operations Personnel. Transportation Research Board, 1984.