APA (7th ed.) Citation

Christian, J. L. (1976). Extra-terrestial intelligence: The first encounter. Prometheus Books.

Chicago Style (17th ed.) Citation

Christian, J. L. Extra-terrestial Intelligence: The First Encounter. Buffalo, NY 14215: Prometheus Books, 1976.

MLA (9th ed.) Citation

Christian, J. L. Extra-terrestial Intelligence: The First Encounter. Prometheus Books, 1976.

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