Dyfyniad APA

National Research Council (U.S.). Transportation Research Board. (1992). Truck research profiles: 1991 update. Transportation Research Board, National Research Council.

Dyfyniad Arddull Chicago

National Research Council (U.S.). Transportation Research Board. Truck Research Profiles: 1991 Update. Washington, D.C: Transportation Research Board, National Research Council, 1992.

Dyfyniad MLA

National Research Council (U.S.). Transportation Research Board. Truck Research Profiles: 1991 Update. Transportation Research Board, National Research Council, 1992.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.