APA-viite (7. p.)
Rossi, I. D. (2011). Vtiger CRM beginner's guide: Record and consolidate all your customer information with vtiger CRM. Packt Pub. Ltd..
Chicago-viite (17. p.)
Rossi, Ian D. Vtiger CRM Beginner's Guide: Record and Consolidate All Your Customer Information with Vtiger CRM. Birmingham, U.K.: Packt Pub. Ltd., 2011.
MLA-viite (9. p.)
Rossi, Ian D. Vtiger CRM Beginner's Guide: Record and Consolidate All Your Customer Information with Vtiger CRM. Packt Pub. Ltd., 2011.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.