Gaya APA

Velte, T, J., Velte, A, T. (2008). Green IT : reduce your information system`s environmental impact while adding to the bottom lina (-). New York: Mc Graw-Hill.

Gaya MLA

Velte, Toby, J.., Velte, Anthony, T.. "Green IT : reduce your information system`s environmental impact while adding to the bottom lina". - New York: Mc Graw-Hill, 2008. Text.