Some details on reading the citations - for example if looks like this:
X-2 Sets Altitude Record at 126,000 Ft. il Aviation Week 65: 29 S 24 '56

Read it as:
"X-2 Sets Altitude Record at 126,000 Ft." (article includes an) illustration. Aviation Week. Volume 65. page 29. September 24, 1956.

Additional X-2 related books can be found here.

Updated December 2023

Whitford, Ray. "Bell X-2". Part 2. Air International. Vol. 51. No. 3. September 1996. pp. 168-175.

Miller, Jay. "Mach 3.0: The Story of Bell's X-2, Pioneer of Supersonic Flight". Part 1. Airpower. Vol. 6. No. 1. January 1976. pp. 40-51.

DiGregorio, Barry. "Light the Fuse and Go". Aviation. Vol. 4. No. 1. September 1993. pp. 38-45, 70-72.

Hotz, Robert. "NACA Reveals New Results of Supersonic Research Program". Aviation Week. Vol. 47. No. 1. July 7, 1947. pp. 18, 21.

Staff. "X-2 Rocket Plane Groomed for Tests". Aviation Week. Vol. 57. No. 5. August, 4, 1952. p. 70.

Staff. "Bell X-2 Masks Unconventional Design". Aviation Week. Vol. 63. August 15, 1955. p. 15.

Staff. "Bell X-2 Hits 1,900 MPH to Set New Record". Aviation Week. Vol. 65. No. 6. August 6, 1956. p. 454.

Staff. "X-2 Sets Altitude Record at 126,000 Ft". Aviation Week. Vol. 65. September 24, 1956. p. 29.

Staff. "Everest Blames Slow Moving X-2 Project on Lack of Research Funds". Aviation Week. Vol. 65. No. 14. October 1, 1956. p. 34.

Clark, Evert. "X-2's Loss Leaves Research Gap; Burden Shifts to X-1B, X-1E". Aviation Week. Vol. 65. No. 15. October 8, 1956. p. 32.

Staff. "About-Face on X-2". Aviation Week. Vol. 65. No. 16. October 15, 1956. p. 25.

Staff. "Pilot Skill, Engine Performance Give X-2 Record On Final Run". Aviation Week. Vol. 65. No. 17. October 22, 1956. p. 30.

Stone, Irving and Evert Clark. "USAF Reveals New X-2 Crash Details". Aviation Week. Vol. 65. November 11, 1956. pp. 26-27.

Kincheloe, Iven. "Capt. Kincheloe's Story of X-2 Record". Aviation Week. Vol. 67. No. 25. December 23, 1957. pp. 65, 67-68.

Staff. "Hopes of Bell Test Pilot's Wife, 3 Children Rest With Searchers". Buffalo Evening News. Vol. CXLVL. No. 28. May 13, 1953. p. 1.

"It's Waiting That's Hard, Says Mother of Missing Bell Airman".
"RCAF Fliers Also Report Seeing Oil Slick in Lake".
"Suffering Shock, Injured Crew Chief Remains Silent to Guard Top Secret".
"Test Flier Is Known Through Industry, Flew X-2 Last Year On the West Coast".

Gross, Martin. "The Torturous Life of the X-2". Coronet. Vol. 42. No. 2. June 1957. pp. 152-158.

Day, Richard. Coupling Dynamics in Aircraft: A Historical Perspective. NASA SP-532. Edwards, CA. 1997.

Elby, John. "Kincholoe's Widow, Children Visits His School". Dowagiac Daily News. October 21, 1996.

Ewan, Jamie. "Was Bell’s remarkable Mach 3-capable X-2 a shattered dream or ‘The Right Stuff’". Fly Past. October 20, 2023.

Miller, Jay. "Bell's Trisonic X-2". Flight Journal. Vol. 5. No. 4. August 2000. pp. 62-68, 70-71.

Matthews. Henry. Jean 'Skip' Ziegler: Legendary American Chief Test Pilot. HPM Publications, Beirut, Lebanon, 1996.

Everest, Frank and Ben Kocivar. "I Have A Date With Outer Space". Look. Vol. 20. No. 4. February 21, 1956. pp. 112-116, 118.

Staff. "X-2 to Probe Heat Barrier". Naval Aviation News. October 1955. p. 35.

Staff. "The 'X's: Now Up to 2,000 MPH". Newsweek. Vol. 46. No. 8. August 22, 1955 p. 24

Staff. "Mission to the Unknown". Newsweek. Vol. 47. No. 14. October 3, 1955. pp. 76-77.

Staff. "Next--2,500 MPH". Newsweek. Vol. 48. No. 7. August 13, 1956. p. 69.

Staff. "Secret of the X-2". Newsweek. Vol. 48. No. 14. October 1, 1956. pp. 78-79.

Staff. "Disaster in the Desert". Newsweek. Vol. 48. No. 15. October 8, 1956. p. 51.

Staff. "Snow, Speed, Teaching". Newsweek. Vol. 48. No. 18. October 29, 1956. p. 70.

Hallion, Richard. On the Frontier, 1946-1981. NASA SP-4303. Washington D. C., 1984 (PDF Download)

Matthews, Henry. The Saga of the Bell X-2. HPM Publications, Beirut, Lebanon, 1999

Harvey, Frank. "Inferno in the Sky". The Saturday Evening Post. Vol. 228. No. 47. May 19, 1956. pp. 38-39, 139.

Staff. "Thicket Without Thorns". Time. Vol. 68. No. 7. August 13, 1956. p. 46.

Staff. "Nearest to Space". Time. Vol. 68. No. 14. October 1, 1956. p. 72.

Staff. "Into the Unknown". Time. Vol. 68. No. 15. October 15, 1956. p. 25.

Staff. "Flight Beyond Perfection". Time. Vol. 68. No. 20. November 12, 1956. pp. 76, 78.

Staff. "Bell X-2 Will Probe Thermal Barrier". Western Aviation. Vol. 35. No. 9. September 1955. p. 16.

Miller, Jay. "Mach 3.0: The Story of Bell's X-2, Pioneer of Supersonic Flight". Part 2. Wings. February 1976. pp. 46-53.

Crossfield, A. Scott and Clay Blair, Jr. Always Another Dawn: The Story of a Rocket Test Pilot. Ayer Company Publishers, Salem, New Hampshire, 1994.

The X-2 PR Fiasco, American Aviation, November 19, 1956

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