APA استشهاد

Sagan, C. (1996). The demon-haunted world: Science as a candle in the dark. headline book publishing.

استشهاد بنمط شيكاغو

Sagan, Carl. The Demon-haunted World: Science as a Candle in the Dark. London: headline book publishing, 1996.

MLA استشهاد

Sagan, Carl. The Demon-haunted World: Science as a Candle in the Dark. headline book publishing, 1996.