APA način citiranja

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

Čikaški stil citiranja

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

MLA način citiranja

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