Great Britain. National Rivers Authority. (1991). The Quality of rivers, canals and estuaries in England and Wales: Report of the 1990 survey. The Authority.
芝加哥风格引文Great Britain. National Rivers Authority. The Quality of Rivers, Canals and Estuaries in England and Wales: Report of the 1990 Survey. Bristol: The Authority, 1991.
MLA引文Great Britain. National Rivers Authority. The Quality of Rivers, Canals and Estuaries in England and Wales: Report of the 1990 Survey. The Authority, 1991.
警告：这些引文格式不一定是100％准确.