1. The ego, its properties and its distinction from the self sentiment and super ego;Birkett,1979
2. Personality and motivation structure and measurement;Cattell,1957
3. Psychiatric screening of flying personnel. Personality structure in objective tests—a study of 1000 Air Force students in basic pilot training;Cattell;USAF School of Aviation Medicine Report No. 9,1955
4. Theory of situational, instrument, second order and refraction factors in personality structure research;Cattell;Psychol. Bull.,1961
5. The interpretation of Pavlov's typology, and the arousal concept, in replicated trait and state factors;Cattell,1972