A couple of references relating to Principal Components Analysis as applied using SPSS:
Gray, C.D. and Kinnear, P. 2012. SPSS 19 Made Simple. New York: Psychology Press.
[Chapter on latent variables/factor analysis: earlier editions also relevant].
Brace, N. et al. 2012. Statistics for Psychologists (5th edition). Basingstoke: Palgrave Macmillan.
[Chapter on Factor Analysis and Reliability and Dimensionality of Scales; earlier editions also relevant].