^Hair, J.F.; Hult, G.T.M.; Ringle, C.M.; Sarstedt, M. (2014). A Primer on Partial Least Squares Structural Equation Modeling (PLS-SEM). Thousand Oaks, CA: Sage. ISBN 9781452217444. http://www.pls-sem.com/
Reinartz, Werner, Michael Haenlein, and Jörg Henseler. "An empirical comparison of the efficacy of covariance-based and variance-based SEM." International Journal of research in Marketing 26.4 (2009): 332-344.