Google Apps and CRM: What works, what doesn't, and how to tell if your organization should integrate the two - http://www.techrepublic.com/blog/google-in-the-enterprise/google-apps-and-crm-what-works-what-doesnt-and-how-to-tell-if-your-organization-should-integrate-the-two/530
How To Select A CRM System: Nine Factors To Consider When Evaluating CRM - http://www.techrepublic.com/whitepapers/how-to-select-a-crm-system-nine-factors-to-consider-when-evaluating-crm/240475
Best CRM for Small Business: Insightly Vs ZohoCRM Vs Nimble - http://fitsmallbusiness.com/best-crm-for-small-business/
Reviews and Outlines
About Zoho
Zoho CRM with Google Apps - https://www.zoho.com/crm/help/google-apps/index.html