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| | The Temporal Doorway - The Levelland Sightings Of 1957 by Antonio F. Rullán: References and Sources (Site not responding. Last check: 2007-10-11) |
 | | Center for UFO Studies, CUFOS Files on Levelland, Chicago IL Fund for UFO Research, (1995), UFOs and Science: The Collected Writings of Dr. James E. McDonald, |
 | | CUFOS file on Levelland, 1 page memo to file from Sgt. Norman P. Barth, February 19, 1958, titled: “Prime Source in Levelland UFO Case”, |
 | | CUFOS’ file on Levelland, 3 page summary from ATIC titled: “Levelland, Texas: 2,3, and 4 November 1957” |
| www.temporaldoorway.com /ufo/guestpapers/levelland/refssourcesandnotes.htm (2053 words) |
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