Gaya APA

Velte, T. et al (2008). Green IT: Reduce Your Information System's Environmental Impact While Adding to the Bottom Line (1). USA: McGraw-Hill Companie, In.

Gaya MLA

Velte, Toby. et al. "Green IT: Reduce Your Information System's Environmental Impact While Adding to the Bottom Line". 1 USA: McGraw-Hill Companie, In, 2008. Hardcopy (Textbook).