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2. Christal , R. E. Dec. 1952.A factor analysis of Airman Classification Battery AC-1A and radar operator final school gradeDec., 37–52. USAF Training Command Human Resources Research CenterResearch Note
3. Cox , J. A. Jr. Sept. 1951.A factor analysis of Airman Classification Battery test scores for airplane sheet metal worker technical school graduatesSept., 23–51. USAF Training Command Human Resources Research CenterResearch Note
4. Dailey , J. T. Brokaw , L. D. and Lecznar , W. B. Nov. 1948.The development of the Airman Classification Test Battery, Nov., 48–4. Barksdale, AFB: Hq., Air Training Command.Research Bulletin
5. Fruchter , B. Nov. 1949.The factorial content of the Airman Classification Battery: I. Factor analysis of 1948 Normative Survey BatteryNov., 49–1. USAF Training Command Human Resources Research CenterResearch Bulletin