APA引文

Sagan, C., & Leonard, J. N. (1967). <Planets>. Time life books.

Chicago Edition Citation

Sagan, Carl, and Jonathan Norton Leonard. <Planets>. New York: Time life books, 1967.

MLA引文

Sagan, Carl, and Jonathan Norton Leonard. <Planets>. Time life books, 1967.

警告：这些引文格式不一定是100％准确.