* http://amstrad.cpc.free.fr/article.php?sid=27 - How to fix the keyboard of your CPC (english)
* http://www.sellmyretro.com/ - Buy new keyboard membranes for CPC664 from RWAP software
* http://www.rwapsoftware.co.uk/ - RWAP Software, makers of membranes for Sinclair, Enterprise and CPC664
* http://www.tradinpost.com/ - Buy new keyboard membranes for Amstrad 464/6128 Plus