To cite package ‘igraphdata’ in publications use:

  Csárdi G, Müller K (2024). _igraphdata: A Collection of Network Data
  Sets for the 'igraph' Package_. R package version 1.0.1.9008,
  <https://github.com/igraph/igraphdata>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {igraphdata: A Collection of Network Data Sets for the 'igraph' Package},
    author = {Gábor Csárdi and Kirill Müller},
    year = {2024},
    note = {R package version 1.0.1.9008},
    url = {https://github.com/igraph/igraphdata},
  }