Mason, C.A., and Tu, S. (1995). Estimation of factor scores via FASCOR.  Educational and Psychological Measurement, 55, 791-794.

The potential value of using factor scores as latent variables is discussed, and the mathematical procedure for estimating factor scores is reviewed. A computer program is described that estimates factor scores for a data set given the factor pattern matrix, the factor correlation matrix, and the variable correlation matrix. Sample input and output are presented.