APA (7th ed.) Citation

Ridpath, I. (1976). Worlds beyond: A report on the search for life in space (1st U.S. ed.). Harper & Row.

Chicago Style (17th ed.) Citation

Ridpath, Ian. Worlds Beyond: A Report on the Search for Life in Space. 1st U.S. ed. New York: Harper & Row, 1976.

MLA (9th ed.) Citation

Ridpath, Ian. Worlds Beyond: A Report on the Search for Life in Space. 1st U.S. ed. Harper & Row, 1976.