I'm looking to buy some motorsport books. I'm interested particularly in world and national rallying, Formula 1 and international single seaters, sports cars and touring cars. But not limited to anything. A good book is a good book. Something thats not difficult to read (as per language used) but which also goes in depth (whether it deal with races, personalities or cars.) Encyclopedic type books I find particularly interesting as you can gain a broad range of knowledge about a sport or era, as opposed to one man's journey through the ranks (e.g. as in a biography, which are good reads in a different light.)

So what motorsport books have you read and found particularly enjoyable and feel worthy of recommendation?