APA

Department of the Environment. Scottish Development Department. Welsh Office, . (1973). Traffic signs manual. Chapter 8. Traffic safety measures for road works. London: Department of the Environment. Scottish Development Department. Welsh Office.

Chicago

Department of the Environment. Scottish Development Department. Welsh Office, . 1973. Traffic signs manual. Chapter 8. Traffic safety measures for road works. London: Department of the Environment. Scottish Development Department. Welsh Office.

Harvard

Department of the Environment. Scottish Development Department. Welsh Office, . (1973). Traffic signs manual. Chapter 8. Traffic safety measures for road works. London: Department of the Environment. Scottish Development Department. Welsh Office.

MLA

Department of the Environment. Scottish Development Department. Welsh Office, . Traffic signs manual. Chapter 8. Traffic safety measures for road works. London: Department of the Environment. Scottish Development Department. Welsh Office. 1973.