To cite igraph please use these three references.

Csárdi G, Nepusz T (2006). “The igraph software package for complex network research.” InterJournal, Complex Systems, 1695. https://igraph.org.

Antonov M, Csárdi G, Horvát S, Müller K, Nepusz T, Noom D, Salmon M, Traag V, Welles BF, Zanini F (2023). “igraph enables fast and robust network analysis across programming languages.” arXiv preprint arXiv:2311.10260. doi:10.48550/arXiv.2311.10260.

Csárdi G, Nepusz T, Traag V, Horvát S, Zanini F, Noom D, Müller K, Schoch D, Salmon M (2025). igraph: Network Analysis and Visualization in R. doi:10.5281/zenodo.7682609, R package version 2.2.1, https://CRAN.R-project.org/package=igraph.

Corresponding BibTeX entries:

  @Article{,
    title = {The igraph software package for complex network research},
    author = {Gábor Csárdi and Tamás Nepusz},
    journal = {InterJournal},
    volume = {Complex Systems},
    pages = {1695},
    year = {2006},
    url = {https://igraph.org},
  }

  @Article{,
    title = {igraph enables fast and robust network analysis across
      programming languages},
    author = {Michael Antonov and Gábor Csárdi and Szabolcs Horvát and
      Kirill Müller and Tamás Nepusz and Daniel Noom and Maëlle Salmon
      and Vincent Traag and Brooke Foucault Welles and Fabio Zanini},
    journal = {arXiv preprint arXiv:2311.10260},
    year = {2023},
    doi = {10.48550/arXiv.2311.10260},
  }

  @Manual{,
    title = {{igraph}: Network Analysis and Visualization in R},
    author = {Gábor Csárdi and Tamás Nepusz and Vincent Traag and
      Szabolcs Horvát and Fabio Zanini and Daniel Noom and Kirill
      Müller and David Schoch and Maëlle Salmon},
    year = {2025},
    note = {R package version 2.2.1},
    doi = {10.5281/zenodo.7682609},
    url = {https://CRAN.R-project.org/package=igraph},
  }