APA Edition Citation

Shklovskii, I. S., Paula Fern, & Sagan, C. (1966). Intelligent life in the universe. Holden Day Inc..

Chicago Edition Citation

Shklovskii, I. S., Paula Fern, and Carl Sagan. Intelligent Life in the Universe. Holden Day Inc., 1966.

MLA Edition Citation

Shklovskii, I. S., et al. Intelligent Life in the Universe. Holden Day Inc., 1966.

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