Gaya APA

Continental Drift. ([s.a.]). New York: [s.n.].

Gaya Chicago

Continental Drift. . New York: [s.n.], [s.a.]. Text.

Gaya MLA

Continental Drift. . New York: [s.n.], [s.a.]. Text.

Gaya Turabian

Continental Drift. New York: [s.n.], [s.a.]. Print.