APA

Department of the Environment. Welsh Office [HMSO], . (1975). Calculation of road traffic noise. London: Department of the Environment. Welsh Office [HMSO].

Chicago

Department of the Environment. Welsh Office [HMSO], . 1975. Calculation of road traffic noise. London: Department of the Environment. Welsh Office [HMSO].

Harvard

Department of the Environment. Welsh Office [HMSO], . (1975). Calculation of road traffic noise. London: Department of the Environment. Welsh Office [HMSO].

MLA

Department of the Environment. Welsh Office [HMSO], . Calculation of road traffic noise. London: Department of the Environment. Welsh Office [HMSO]. 1975.