APA Style

Hurley, Patrick M.. (). How Old is the Earth? . New York: Anchor Press.

Chicago Style

Hurley, Patrick M.. How Old is the Earth?. New York: Anchor Press, . Text.

MLA Style

Hurley, Patrick M.. How Old is the Earth?. New York: Anchor Press, . Text.

Turabian Style

Hurley, Patrick M.. How Old is the Earth?. New York: Anchor Press, . Print.