APA
American Association of State Highway and, Transportation Officials, . (1991). European Asphalt Study Tour (EAST) 1990. Washington DC: American Association of State Highway and.
Chicago
American Association of State Highway and, Transportation Officials, . 1991. European Asphalt Study Tour (EAST) 1990. Washington DC: American Association of State Highway and.
Harvard
American Association of State Highway and, Transportation Officials, . (1991). European Asphalt Study Tour (EAST) 1990. Washington DC: American Association of State Highway and.
MLA
American Association of State Highway and, Transportation Officials, . European Asphalt Study Tour (EAST) 1990. Washington DC: American Association of State Highway and. 1991.