Water Gardens by Paul Dyer - Comprehensive portfolio of water gardens designed by the Royal Horticultural Society Gold Medal winner. - http://www.netgardens.co.uk/
George's Japanese Garden - Japanese garden featuring a koi pond, bonsai, Zen garden with photos. Includes information on DIY projects and on koi varieties. - http://koi-z-are-us.20m.com/
The Real Mckoi - Beginner's guide to koi carp and pond construction. - http://www.therealmckoi.co.uk/