“ARCHIVE OF LOCAL CO-OPERATIVE AND PIONEERS SOCIETIES”. The National Archives. 2011年4月17日閲覧。 “The Middleton and Tonge Industrial Co-operative Society merged with the Oldham Industrial Co-operative Society in the early 1970's and six years later the Rochdale Equitable Pioneers Society and the Oldham Industrial Co-operative Society merged to form to Pioneers Co-operative Society Ltd.”