Rackham, Oliver (1986). The History of the Countryside: The full fascinating story of Britain's landscape. London: J.M. Dent & Sons Ltd. ISBN 0-460-04449-4 /wiki/ISBN_(identifier) ↩
Jones, Melvin, ed. (1997). Aspects of Sheffield: Discovering Local History. Wharncliffe Publishing. p. 67. ISBN 1-871647-40-1. 1-871647-40-1 ↩