Differences in Empirical Results Using Principal Components and Factor Analysis:

HUBBARD, R. and S. J. ALLEN (1987) “A cautionary note on the use of principal components analysis: supportive empirical evidence.” Soc. Methods & Research 16: 301-308.

WILKINSON, L. (1989) “A cautionary note on the use of factor analysis.” Soc. Methods & Research 17: 449-459.