https://www.facebook.com/thecapdetective/ – A Facebook page dedicated to the identification of awarded players caps
http://internationalcaps.webs.com/ – A great source of information on individual caps sorted by sport and types
http://www.hockeymuseum.net/ – The Hockey Museum is a relatively new organisation whose aim is to preserve, share and celebrate the rich heritage and history of the sport of hockey.
http://www.nma.gov.au/ The National Museum of Australia
http://rugby-memorabilia.co.uk/ Home of the Rugby Memorabilia Society. The world wide home for rugby union memorabilia collectors.
http://www.englandrugby.com/twickenham/world-rugby-museum/ – World Rugby Museum based on Twickenham. A good selection of caps going back as far as 1871.
http://www.principalitystadium.wales/tours/index.php – For details of tours of the Principality Stadium.
https://www.rugbyschool.co.uk/commercial/school-shop-and-tours/tours/ – For tours of Rugby School and its museum including its sporting past.
http://www.wru.co.uk/eng/thewru/history/index.php – A guide to the Welsh Rugby Union and links to all other things WRU.i