David W. (University of Wisconsin – Madison, USA) Kaplan 
Structural Equation Modeling : Foundations and Extensions [PDF ebook] 
Foundations and Extensions

Using detailed, empirical examples, Structural Equation Modeling, Second Edition, presents a thorough and sophisticated treatment of the foundations of structural equation modeling (SEM). It also demonstrates how SEM can provide a unique lens on the problems social and behavioral scientists face. Intended Audience While the book assumes some knowledge and background in statistics, it guides readers through the foundations and critical assumptions of SEM in an easy-to-understand manner.