APA引文

Sagan, C. (1994). Pale blue dot: A version of the human future in space. Randon House.

Chicago Edition Citation

Sagan, Carl. Pale Blue Dot: A Version of the Human Future in Space. New York: Randon House, 1994.

MLA引文

Sagan, Carl. Pale Blue Dot: A Version of the Human Future in Space. Randon House, 1994.

警告：这些引文格式不一定是100％准确.