Kraay, J. H. (1985). An international study on the calibration of traffic conflict techniques. Institute for Road Safety Research SWOV, The Netherlands.
Chicago-referens (17:e uppl.)Kraay, J. H. An International Study on the Calibration of Traffic Conflict Techniques. Leidschendam: Institute for Road Safety Research SWOV, The Netherlands, 1985.
MLA-referens (9:e uppl.)Kraay, J. H. An International Study on the Calibration of Traffic Conflict Techniques. Institute for Road Safety Research SWOV, The Netherlands, 1985.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.