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Surden, Esther (4 July 1977). "ICL Offers 220 Series CPU as Singer System Ten Upgrade". Computerworld. XI (27): 29. Retrieved 2 November 2022. ...the maximum memory size of each partition on the older processor was 10K char. https://books.google.com/books?id=wMe6erbb5V4C&dq=%22singer+system+ten%22&pg=PA29
"A New Lease of Life for Singer's System 10". The Sydney Morning Herald. 18 September 1979. p. 27. Retrieved 3 June 2012. https://news.google.com/newspapers?nid=1301&dat=19790918&id=_IRWAAAAIBAJ&pg=1042,6791928
Walton, A. (November 1981). "Architecture of the ICL System 25" (PDF). ICL Technical Journal. 2 (4). Archived from the original (PDF) on 25 October 2019. Retrieved 23 February 2020. https://web.archive.org/web/20191025204719/https://www.fujitsu.com/uk/Images/ICL-Technical-Journal-v02i04.pdf
Knight, Michael (Winter 2009). "System 25 - ICL's Cinderella Success of the Eighties". Resurrection (49). Retrieved 23 February 2020. http://www.computerconservationsociety.org/resurrection/res49.htm#h
Roberts, Bryan; Berg, Natalie (2012). Walmart - Key Insights and Practical Lessons from the World's Largest Retailer. London: Kogan Page. p. 139. ISBN 9780749462741. Walmart ... installed a Singer System 100 network... 9780749462741