APA

Robertson D., . (1975). Urban traffic control systems - Present and potential. : TRRL Symposium April 1975. Paper 6. [Supplementary Report nr 231].

Chicago

Robertson DI, . 1975. Urban traffic control systems - Present and potential. : TRRL Symposium April 1975. Paper 6. [Supplementary Report nr 231].

Harvard

Robertson D., . (1975). Urban traffic control systems - Present and potential. : TRRL Symposium April 1975. Paper 6. [Supplementary Report nr 231].

MLA

Robertson DI, . Urban traffic control systems - Present and potential. : TRRL Symposium April 1975. Paper 6. [Supplementary Report nr 231]. 1975.