http://www.carmagazine.co.uk/News/Search-Results/First-Official-Pictures/Aston-Martin-Cygnet-2011-production-car-revealed/

Chinese private vehicle ownership stats

http://earlywarn.blogspot.com/2010/01/chinese-transportation-growth.html

Tokyo Transport Issues

http://www.jrtr.net/jrtr04/f02_nak.html

'Boxster tutorial'

 

Marker Rendering Tutorial - Canay Enes

Good rendering tutorial, using Copic markers, Similar techniques could be used within photoshop/sketchbook pro. 

Full tutorial

 

Car Sketching Tutorial - Hector Realubit

Step by step tutorial of drawing a concept car, focusing mainly on the use of line weight. 

Full Tutorial

 Car Sketching Tutorial - Canay Enes

A step by step tutorial looking at how to draw a concept car, Sketching techniques are useful steps, however the rendering lets the tutorial down.

Full Tutorial