Illustrations courtesy of Sutton Coldfield Reference Library, “Miss Bracken’s 1840 Prospect of Sutton from the Cup, showing sheep in Birmingham Road on their way to market.” on U.S. Dept. of Sutton Coldfield Local History Research Group
McCulloch, J. R., & Martin, F. (1866). A Dictionary, Geographical, Statistical, and Historical: Of the Various Countries, Places, and Principal Natural Objects in the World. London, UK: Longmans, Green.
Pitt, W., & Le Couteur, F. (1810). A general view of the agriculture of the County of Worcester: With observations on the means of its improvement ; published by order of the Board of Agriculture, and Internal Improvement. London, UK: Printed for Richard Phillips, J. Adlard, printer.
PLUMB, C. S. (1920). Types and Breeds of Farm Animals. Boston: Ginn.
Porter, V., & Mason, I. L. (2002). Mason’s World Dictionary of Livestock Breeds, Types and Varieties (5th ed.). Wallingford, Oxfordshire, UK: CABI Publishing.
Porter, V., Alderson, L., Hall, S. J. G., & Sponenberg, D. P. (2016). Mason’s World Encyclopedia of Livestock Breeds and Breeding: 2 Volume Pack (1st ed.). Wallingford, Oxfordshire, UK: CABI.
United States. Bureau of Animal Industry. (1885). Annual Report of the Bureau of Animal Industry for the Year ..., (Vol. 6–7). Washington, DC: U.S. Government Printing Office.