To cite multigraph in publications use:

Ostoic J (2021). Algebraic Analysis of Social Networks: Models, Methods and Applications Using R, series Wiley Series in Computational and Quantitative Social Science. Wiley. ISBN 9781119250326.

Corresponding BibTeX entry:

  @Book{,
    title = {Algebraic Analysis of Social Networks: Models, Methods and
      Applications Using R},
    author = {J.A.R. Ostoic},
    publisher = {Wiley},
    year = {2021},
    series = {Wiley Series in Computational and Quantitative Social
      Science},
    isbn = {9781119250326},
    lccn = {2020025444},
  }