APA Citation

Sagan, C. 1., & Sagan, C. 1. The backbone of night.

Chicago Style Citation

Sagan, Carl 1934-1996, and Carl 1934-1996 Sagan. The Backbone of Night.

MLA Citation

Sagan, Carl 1934-1996, and Carl 1934-1996 Sagan. The Backbone of Night.

Warning: These citations may not always be 100% accurate.