Road Research Laboratory (Great Britain). (1972). Road research. H.M. Stationery Off..
Chicago-referens (17:e uppl.)Road Research Laboratory (Great Britain). Road Research. London: H.M. Stationery Off., 1972.
MLA-referens (8:e uppl.)Road Research Laboratory (Great Britain). Road Research. H.M. Stationery Off., 1972.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.