APA (7th ed.) Citation

Weldon, J., & Levitt, Z. (1975). UFO's: What on earth is happening? Harvest House Publishers.

Chicago Style (17th ed.) Citation

Weldon, John, and Zola Levitt. UFO's: What on Earth Is Happening? Irvine, Calif: Harvest House Publishers, 1975.

MLA (9th ed.) Citation

Weldon, John, and Zola Levitt. UFO's: What on Earth Is Happening? Harvest House Publishers, 1975.