1. The location of superfactors P, E and N within an unexplored factor space;Barrett;Person. individ. Diff.,1980
2. Superfactors P, E and N in a comprehensive factor space;Eysenck;Multivar. behav. Res.,1978
3. Manual for the Eysenck Personality Inventory;Eysenck,1975
4. Psychoticism as a Dimension of Personality;Eysenck,1976
5. The Experimental Study of Freudian Theories;Eysenck,1973