To cite qgraph in publications use:

Costantini, G., Richetin, R., Preti, E., Casini, E., Epskamp, S., Perugini, M. (2019) Stability and variability of personality networks. A tutorial on recent developments in network psychometrics Personality and Individual Differences 136, 68-78 https://doi.org/10.1016/j.paid.2017.06.011

Corresponding BibTeX entry:

  @Article{,
    title = {Stability and variability of personality networks. A
      tutorial on recent developments in network psychometrics},
    author = {Giulio Costantini and Juliette Richetin and Emanuele
      Preti and Erica Casini and Sacha Epskamp and Marco Perugini},
    journal = {Personality and Individual Differences},
    year = {2019},
    volume = {136},
    number = {1 January 2019},
    pages = {68-78},
    url = {https://doi.org/10.1016/j.paid.2017.06.011},
  }