1. 1. M. E. Baehr, The relationship between the category scores in the SRA Employee Inventory . Unpublished report, University of Chicago, 1951 .
2. Morale: a bibliographical review.
3. 4. H. E. Garbett, Statistics in Psychology and Education . New York: Longmans, Green & Co., 1947 . P.431 .
4. 5. T. W. Harrell, Industrial Psychology . New York: Rinehart and Co., 1949 . P.266 .