Wilks, S.S. "Weighting Systems for Linear Functions of Correlated Variables When There Is No Dependent Variable." Psychometrika, III (1938), 23-40.
2.
Guilford, J.P. , Lovell, C. and Williams, R.M. "Completely Weighted Versus Unweighted Scoring in An Achievement Examination." Educational and Psychological Measurement, II (1942), 15-21.
3.
McCall, W.A. and Others. "Construction of the Multi-Mental Scale." Teachers College Record, XXVII (1925-1926), 407-408.
4.
McCall, W.A.Manual of Directions for the Multi-Mental Scale. New York : Teachers College, Columbia University: Bureau of Publications.