1. Anon. Perthshire Courier, 3rd August, 1826.
2. Anon. In: Rivington C, Rivington J, editors. Annual Register of the Year. Baldwin, Craddock and Joy, 1827.
3. Anon. Surface Water: United Kingdom 1974–76, 1982:150.
4. Anon. 1990 Yearbook, Hydrological Data UK Series. Institute of Hydrology, 1991:200.
5. Anon. Hydrological Review of 1999. Water Watch (http://www.nwl.ac.uk/ih/), 2000.