Classic Travelling -
Worldwide motoring tours for vintage, classic and sports cars.
http://www.classictravelling.com

Octane Magazine -
the magazine for the world's best classic and performance cars.
http://www.octane-magazine.com

Vintage Sports-Car Club -
Sporting Motor Club celebrating Pre-war Cars.
http://www.vscc.co.uk

HGPCA -
The International Association For Owners And Drivers Of Historic Grand Prix Cars.
http://www.hgpca.net