Krell, K., Ernst, R., & Lenz, K. (1978). Costs and benefits of general speed limits: (maximum and minimum speeds) : report of the thirty-seventh Round Table on Transport Economics, held in Paris on 24th and 25th February, 1977. European Conference of Ministers of Transport ; sold by OECD Publications Center].
Chicago-viite (17. p.)Krell, Karl, R. Ernst, ja Karl-Heinz Lenz. Costs and Benefits of General Speed Limits: (maximum and Minimum Speeds) : Report of the Thirty-seventh Round Table on Transport Economics, Held in Paris on 24th and 25th February, 1977. [Paris] : [Washington, D.C.: European Conference of Ministers of Transport ; sold by OECD Publications Center], 1978.
MLA-viite (8. p.)Krell, Karl, et al. Costs and Benefits of General Speed Limits: (maximum and Minimum Speeds) : Report of the Thirty-seventh Round Table on Transport Economics, Held in Paris on 24th and 25th February, 1977. European Conference of Ministers of Transport ; sold by OECD Publications Center], 1978.