APA

Department of the Environment. Scottish Development Department. Welsh Office, . (1976). Aggregates. London: Department of the Environment. Scottish Development Department. Welsh Office.

Chicago

Department of the Environment. Scottish Development Department. Welsh Office, . 1976. Aggregates. London: Department of the Environment. Scottish Development Department. Welsh Office.

Harvard

Department of the Environment. Scottish Development Department. Welsh Office, . (1976). Aggregates. London: Department of the Environment. Scottish Development Department. Welsh Office.

MLA

Department of the Environment. Scottish Development Department. Welsh Office, . Aggregates. London: Department of the Environment. Scottish Development Department. Welsh Office. 1976.