APA (7th ed.) Citation

Howard, D., & Roberts, M. (2004). The British UFO files. TVF International.

Chicago Style (17th ed.) Citation

Howard, David, and Madoc Roberts. The British UFO Files. London: TVF International, 2004.

MLA (9th ed.) Citation

Howard, David, and Madoc Roberts. The British UFO Files. TVF International, 2004.