Transport and Road Research Laboratory & Leonard, D. R. (1980). The design of traffic management schemes: Proceedings of a seminar held at the Transport and Road Research Laboratory, Crowthorne, 9/10 May 1978. Transport and Road Research Laboratory, Urban Networks Division.
Cita Chicago (17th ed.)Transport and Road Research Laboratory i D. R. Leonard. The Design of Traffic Management Schemes: Proceedings of a Seminar Held at the Transport and Road Research Laboratory, Crowthorne, 9/10 May 1978. Crowthorne, Berk: Transport and Road Research Laboratory, Urban Networks Division, 1980.
Cita MLA (9th ed.)Transport and Road Research Laboratory i D. R. Leonard. The Design of Traffic Management Schemes: Proceedings of a Seminar Held at the Transport and Road Research Laboratory, Crowthorne, 9/10 May 1978. Transport and Road Research Laboratory, Urban Networks Division, 1980.