I have Zinn, but beware that any book will never be able to keep up with all of the different makes of brakes / suspension forks / rear sus bits that change every year.
Basically Its nice to have a book, but MTBs have so many different componenets that change so often the web is the best. The books are good for things like how to true wheels or index your gears, change a tyre / tube, however beyond that they become out of date very quickly.
And thats the same with tools – although you may be able to get a complete kit far cheaper (from the likes of Decathlon / LIDL) than the cost of all the individual tools, chances are yuo'll never use 90% of them. Buy them as you need them – some things are worth it or can be found from the likes of Screwfix that do the same thing but far cheaper