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\bibitem[\protect\astroncite{Azzalini and Genz}{2016}]{mnormt}
Azzalini, A. and Genz, A. (2016).
\newblock {\em The {R} package \texttt{mnormt}: The multivariate normal and $t$
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\bibitem[\protect\astroncite{Bernaards and Jennrich}{2005}]{GPA}
Bernaards, C. and Jennrich, R. (2005).
\newblock {Gradient projection algorithms and software for arbitrary rotation
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\newblock {\em Educational and Psychological Measurement}, 65(5):676--696.

\bibitem[\protect\astroncite{Fox et~al.}{2016}]{sem}
Fox, J., Nie, Z., and Byrnes, J. (2016).
\newblock {\em sem: Structural Equation Models}.
\newblock R package version 3.1-7.

\bibitem[\protect\astroncite{{R Core Team}}{2016}]{R}
{R Core Team} (2016).
\newblock {\em R: A Language and Environment for Statistical Computing}.
\newblock {R Foundation for Statistical Computing}, Vienna, Austria.

\bibitem[\protect\astroncite{Revelle}{2016}]{psych}
Revelle, W. (2016).
\newblock {\em psych: Procedures for Personality and Psychological Research}.
\newblock Northwestern University, Evanston,
  http://cran.r-project.org/web/packages/psych/.
\newblock R package version 1.6.4.

\bibitem[\protect\astroncite{Rosseel}{2012}]{lavaan}
Rosseel, Y. (2012).
\newblock {lavaan}: An {R} package for structural equation modeling.
\newblock {\em Journal of Statistical Software}, 48(2):1--36.

\end{thebibliography}