Gaya APA

Velte, T, J., Velte, A. (2008). Green IT : Reduce your Information system's environmental impact while adding to the bottom line . America: McGraw-Hill.

Gaya MLA

Velte, Toby, J., Velte, Anthony. "Green IT : Reduce your Information system's environmental impact while adding to the bottom line". America: McGraw-Hill, 2008. Buku.