Otani, T. (1967). "Kendo." In J. Goodbody (Ed.): The Japanese Fighting ArtsArchived 29 September 2007 at the Wayback Machine (abridged version, pp. 35–64). London: Arlington Books. Retrieved 7 April 2010.
Wood, R. (c. 2007): Kyushindo Philosophy. Retrieved 22 February 2008. Link updated on 7 April 2010.
tiscali.co.uk
myweb.tiscali.co.uk
Abbe, K. (1960): Letter to Mr. MayoArchived 3 March 2016 at the Wayback Machine (26 August 1960). Retrieved 9 April 2010. This scanned image is hosted by Mayo's organisation.
Otani, T. (1967). "Kendo." In J. Goodbody (Ed.): The Japanese Fighting ArtsArchived 29 September 2007 at the Wayback Machine (abridged version, pp. 35–64). London: Arlington Books. Retrieved 7 April 2010.
Abbe, K. (1960): Letter to Mr. MayoArchived 3 March 2016 at the Wayback Machine (26 August 1960). Retrieved 9 April 2010. This scanned image is hosted by Mayo's organisation.