APA (7th ed.) Citation

Barker, G. (1956). They knew too much about flying saucers. University Books.

Chicago Style (17th ed.) Citation

Barker, Gray. They Knew Too Much About Flying Saucers. New York: University Books, 1956.

MLA (9th ed.) Citation

Barker, Gray. They Knew Too Much About Flying Saucers. University Books, 1956.