Gaya APA

Economy Udate:2009. (2013). New York: [s.n.].

Gaya Chicago

Economy Udate:2009. . New York: [s.n.], 2013. Text.

Gaya MLA

Economy Udate:2009. . New York: [s.n.], 2013. Text.

Gaya Turabian

Economy Udate:2009. New York: [s.n.], 2013. Print.