Salesforce.com For Dummies
Salesforce.com Secrets of Success: Best Practices for Growth and Profitability (2nd Edition)
Salesforce CRM: The Definitive Admin Handbook - Second Edition
Practical Salesforce.com Development Without Code: Customizing Salesforce on the Force.com Platform
Development with the Force.com Platform: Building Business Applications in the Cloud (3rd Edition) (Developer's Library)