APA (7th ed.) Citation

Romero, A. V. (2010). VirtualBox 3.1: Beginner's guide. Packt Pub..

Chicago Style (17th ed.) Citation

Romero, Alfonso V. VirtualBox 3.1: Beginner's Guide. Birmingham, U.K.: Packt Pub., 2010.

MLA (8th ed.) Citation

Romero, Alfonso V. VirtualBox 3.1: Beginner's Guide. Packt Pub., 2010.

Warning: These citations may not always be 100% accurate.