1. Rubery Owen Holdings Ltd. archive, Modern Records Centre, University of Warwick
2. MSS338/RO/11/1 Folder of Reports from Robson, Morrow & Co, dated July 1950-March 1952.
3. MSS338/RO/11/2 Report by Price, Waterhouse & Co, May 1955.
4. MSS338/RO/11/3 Memos from Price, Waterhouse & Co, 22 December 1955.
5. MSS338/RO/11/4 Report from Cooper Brothers on accounts for 10 years to 29 June 1961, dated July 1962.