توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Great Britain. National Rivers Authority. (1991). The Quality of rivers, canals and estuaries in England and Wales: Report of the 1990 survey. The Authority.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

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.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Great Britain. National Rivers Authority. The Quality of Rivers, Canals and Estuaries in England and Wales: Report of the 1990 Survey. The Authority, 1991.