Seifert, Roger (2006). "The Importance of Being Permanent: A Study of the North Staffordshire Miners' Federation from 1869 to 1874". Midland History. 31 (1): 67–90. doi:10.1179/mdh.2006.31.1.67. S2CID162295749.
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Seifert, Roger (2006). "The Importance of Being Permanent: A Study of the North Staffordshire Miners' Federation from 1869 to 1874". Midland History. 31 (1): 67–90. doi:10.1179/mdh.2006.31.1.67. S2CID162295749.