Não informado. (1990). Highway research abstracts. National Research Council, Transportation Research Board.
Chicago-Zitierstil (17. Ausg.)Não informado. Highway Research Abstracts. Washington: National Research Council, Transportation Research Board, 1990.
MLA-Zitierstil (8. Ausg.)Não informado. Highway Research Abstracts. National Research Council, Transportation Research Board, 1990.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.