*[http://www.planetark.com/dailynewsstory.cfm?newsid=25210&newsdate=24-May-2004 "UK Mulled Using Birds for Bio-War After WW2 - Files"] Reuters (May 21, 2004)
* [http://www.pigeon.org/ American Racing Pigeon Union]
* [http://www.pigeon.org/ American Racing Pigeon Union]