Epskamp, Sacha, Angélique O.J. Cramer, Lourens J. Waldorp, Verena D. Schmittmann, and Denny Borsboom. 2012. “Qgraph: Network Visualizations of Relationships in Psychometric Data”. Journal of Statistical Software 48 (4):1-18. https://doi.org/10.18637/jss.v048.i04.