In doing some reviews of several SugarCRM books Sander Van Hooft has posted some of his suggestions for good ones to look into if you're trying to get into how SugarCRM works and using it day-to-day.

Finding the information you need can consume very much time, even more if you are new to the Open Source CRM solution SugarCRM. Not all books however are the right choice for all user types. Buying yourself a decent book may be an obvious time saver, but then, since you're new to all this, what book should you buy?

His suggestions cover a wide range of skill levels including the SugarCRM for Dummies book and a Developer's Guide on extending and enhancing your SugarCRM installation.