Gaya APA

Hard Optimism. (2007). New York: [s.n.].

Gaya Chicago

Hard Optimism. . New York: [s.n.], 2007. Text.

Gaya MLA

Hard Optimism. . New York: [s.n.], 2007. Text.

Gaya Turabian

Hard Optimism. New York: [s.n.], 2007. Print.