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>.

A BibTeX entry for LaTeX users is

  @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},
  }

  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
  <https://doi.org/10.48550/arXiv.2311.10260>.

A BibTeX entry for LaTeX users is

  @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},
  }

  Csárdi G, Nepusz T, Traag V, Horvát Sz, Zanini F, Noom D, Müller K,
  Schoch D, Salmon M (2026). _igraph: Network Analysis and
  Visualization in R_. doi:10.5281/zenodo.7682609
  <https://doi.org/10.5281/zenodo.7682609>, R package version 2.2.1,
  <https://CRAN.R-project.org/package=igraph>.

A BibTeX entry for LaTeX users is

  @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 = {2026},
    note = {R package version 2.2.1},
    doi = {10.5281/zenodo.7682609},
    url = {https://CRAN.R-project.org/package=igraph},
  }