APA (7th ed.) Citation

Duncan,John. (2003). UFOs. Snapping-turtle guides.

Chicago Style (17th ed.) Citation

Duncan,John. UFOs. UK: Snapping-turtle guides, 2003.

MLA (9th ed.) Citation

Duncan,John. UFOs. Snapping-turtle guides, 2003.

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