Some General References:

Grace, JB 2006. Structural Equation Modeling and Natural Systems. Cambridge University Press.

Shipley, B. 2000. Cause and Correlation in Biology. Cambridge University Press.

Kline (2005) Principles and Practice of Structural Equation Modeling. (2nd Edition) Guilford Press.

Hancock & Muller (2006) Structural Equation Modeling: A Second Course. Information Age Publishing, Greenwich, CT.

Bollen (1989) Structural Equations with Latent Variables. John Wiley and Sons.

Lee (2007) Structural Equation Modeling: A Bayesian Approach. John Wiley and Sons.

Useful reference on interpreting SEM results can be found (clickable link) at

Grace, J.B. and K.A. Bollen. 2005. Interpreting the results from multiple regression and structural equation models. Bull. Ecol. Soc. Amer. 86:283-295.

Here is a prepublication copy of Chapter 10 in the Grace 2006 book describing the systematic application of SEM (as a way of illustrating the scientific workflow process. (link)