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Muthén, L.K. , & Muthén, B.O. (1998-2007). Mplus user’s guide (5th ed.). Los Angeles : Muthén & Muthén.

Raudenbush, S.W. , & Bryk, A.S. ( 2002). Hierarchical linear models: Applications and data analysis methods (2nd ed.). Thousand Oaks, CA: Sage.

Skrondal, A. , & Rabe-Hesketh, S. (2004). Generalized latent variable modeling: Multilevel, longitudinal and structural equation models. New York: Chapman & Hall/CRC.