"Admiral Sir Roger Keyes". Dover: Lock and Key of the Kingdom. dover-kent.co.uk. 2000–2006. Archived from the original on 14 October 2004. Retrieved 3 October 2014.
"Royal Oak". Time. 26 March 1928. Archived from the original on 3 March 2009. Retrieved 3 October 2014.
victoriacross.org.uk
"Geoffrey Keyes". Lord Ashcroft VC Collection. Retrieved 30 October 2014.
web.archive.org
"Admiral Sir Roger Keyes". Dover: Lock and Key of the Kingdom. dover-kent.co.uk. 2000–2006. Archived from the original on 14 October 2004. Retrieved 3 October 2014.
"Royal Oak". Time. 26 March 1928. Archived from the original on 3 March 2009. Retrieved 3 October 2014.