Gaya APA

English Skills. (2006). New York: [s.n.].

Gaya Chicago

English Skills. . New York: [s.n.], 2006. Text.

Gaya MLA

English Skills. . New York: [s.n.], 2006. Text.

Gaya Turabian

English Skills. New York: [s.n.], 2006. Print.