Gaya APA

Velte, T. et al (2010). Green IT: Reduce your information system's environmental impact while adding to the bottom line (1). United States of America: McGraw-Hill Companies.

Gaya MLA

Velte, Toby. et al. "Green IT: Reduce your information system's environmental impact while adding to the bottom line". 1 United States of America: McGraw-Hill Companies, 2010. Text.