1. No correlation has been found between person-Alexander, F,1950
2. Gastric ulcer in South;York. Alp, M.H.; Grant, A.;Kerr,1970
3. Ulcers in 'executive' monkeys;Brady, J.V.;Sci. Amer,1958
4. The Diseases of the Stomach;Brinton, W.,1859
5. Personality and Motivation Structure and Measurement. World Book;Cattell, R.B.,1957