del Hoyo, Josep; Elliott, Andrew; Sargatal, Jordi, eds. (1992). Ostrich to Ducks. Handbook of the Birds of the World. Vol. 1. Barcelona: Lynx Edicions. pp. 577–78. ISBN978-84-87334-10-8.
Slack, Donovan (12 August 2005). "Thou art no Romeo". Boston Globe. Retrieved 26 December 2009.
britishbirds.co.uk
Baker, Helen; Stroud, David A.; Aebischer, Nicholas J.; Cranswick, Peter A.; Gregory, Richard D.; McSorley, Claire A.; Noble, David G.; Rehfisch, Mark M. (January 2006). "Population estimates of birds in Great Britain and the United Kingdom"(PDF). British Birds. 99: 25–44. Archived from the original(PDF) on 8 March 2021. Retrieved 3 May 2015.
Parrott, D.; McKay, H. V. (2001). "Mute swan grazing on winter crops: Estimation of yield loss in oilseed rape and wheat. Mute swans occasionally eat insects, amphibians and smaller birds". J. Crop Protection. 20 (10): 913–919. doi:10.1016/s0261-2194(01)00041-2.
"Mute Swan". New York Department of Environmental Conservation. Retrieved 3 May 2012.
nytimes.com
Victor, Daniel (15 September 2022). "Britain Has a New King. The Swans Have a New Owner". The New York Times. Retrieved 5 March 2023. Three companies are still permitted by the monarchy to own swans: The Abbotsbury Swannery, The Vintners Company and The Dyers' Company.
Baker, Helen; Stroud, David A.; Aebischer, Nicholas J.; Cranswick, Peter A.; Gregory, Richard D.; McSorley, Claire A.; Noble, David G.; Rehfisch, Mark M. (January 2006). "Population estimates of birds in Great Britain and the United Kingdom"(PDF). British Birds. 99: 25–44. Archived from the original(PDF) on 8 March 2021. Retrieved 3 May 2015.