Gaya APA

Critical Thinking. (1998). London: [s.n.].

Gaya Chicago

Critical Thinking. . London: [s.n.], 1998. Text.

Gaya MLA

Critical Thinking. . London: [s.n.], 1998. Text.

Gaya Turabian

Critical Thinking. London: [s.n.], 1998. Print.