Gaya APA

Marakas, G, M., O'Brien, J, A. (2013). Introducing to information systems (ed. 16). United States of Amerika: Mc Graw-Hill.

Gaya MLA

Marakas, George, M.., O'Brien, James, A.. "Introducing to information systems". ed. 16 United States of Amerika: Mc Graw-Hill, 2013. Text.