Cita APA (7th ed.)

Great Britain. Dept. of the Environment & Great Britain. Welsh Office. (1975). River pollution survey of England and Wales, updated 1973: River quality and discharges of sewage and industrial effluents. H.M.S.O..

Cita Chicago (17th ed.)

Great Britain. Dept. of the Environment i Great Britain. Welsh Office. River Pollution Survey of England and Wales, Updated 1973: River Quality and Discharges of Sewage and Industrial Effluents. London: H.M.S.O., 1975.

Cita MLA (8th ed.)

Great Britain. Dept. of the Environment i Great Britain. Welsh Office. River Pollution Survey of England and Wales, Updated 1973: River Quality and Discharges of Sewage and Industrial Effluents. H.M.S.O., 1975.