APA استشهاد

Sagan, C. (1997). The demon-haunted world; science as a candle in the dark. Ballantine.

استشهاد بنمط شيكاغو

Sagan, Carl. The Demon-haunted World; Science as a Candle in the Dark. New York: Ballantine, 1997.

MLA استشهاد

Sagan, Carl. The Demon-haunted World; Science as a Candle in the Dark. Ballantine, 1997.