APA (7th ed.) Citation

Billings, H. (1999). Aliens & UFOs: 21 famous UFO sightings : with exercises for developing reading comprehension and critical thinking skills. Jamestown.

Chicago Style (17th ed.) Citation

Billings, Henry. Aliens & UFOs: 21 Famous UFO Sightings : With Exercises for Developing Reading Comprehension and Critical Thinking Skills. Lincolnwood, IL: Jamestown, 1999.

MLA (9th ed.) Citation

Billings, Henry. Aliens & UFOs: 21 Famous UFO Sightings : With Exercises for Developing Reading Comprehension and Critical Thinking Skills. Jamestown, 1999.

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