APA (7th ed.) Citation

Sagan, C. (1966). Intelligent life in the universe / by Carl Sagan, I.S.Shklovskii. Holden-Day.

Chicago Style (17th ed.) Citation

Sagan, Carl. Intelligent Life in the Universe / by Carl Sagan, I.S.Shklovskii. New York: Holden-Day, 1966.

MLA (9th ed.) Citation

Sagan, Carl. Intelligent Life in the Universe / by Carl Sagan, I.S.Shklovskii. Holden-Day, 1966.

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