APA

Varian Hal R, Farrell Joseph, . (2004). The economics of information technology : An introduction. Cambridge: Cambridge University Press.

Chicago

Varian Hal R, Farrell Joseph, . 2004. The economics of information technology : An introduction. Cambridge: Cambridge University Press.

Harvard

Varian Hal R, Farrell Joseph, . (2004). The economics of information technology : An introduction. Cambridge: Cambridge University Press.

MLA

Varian Hal R, Farrell Joseph, . The economics of information technology : An introduction. Cambridge: Cambridge University Press. 2004.