References
Cobb, P R, Rawnsley, P, Grenfell, H E, Griffiths, E, and Cox, S. 1996. Northern Mockingbirds in Britain. British Birds 89: 347-356.
Farnsworth, G, Londono, G A, Martin, J U, Derrickson, K C, and Breitwisch, R. 2020. Northern Mockingbird (Mimus polyglottos), version 1.0. In Birds of the World (A F Poole, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.normoc.01.