To cite RandomFields in publications use:

For general purposes please refer to

  Schlather M, Malinowski A, Oesting M, Boecker D, Strokorb K, Engelke
  S, Martini J, Ballani F, Moreva O, Auel J, Menck PJ, Gross S, Ober U,
  Ribeiro P, Ripley BD, Singleton R, Pfaff B, R Core Team (2022).
  _RandomFields: Simulation and Analysis of Random Fields_. R package
  version 3.3.14, <https://cran.r-project.org/package=RandomFields>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {{RandomFields}: Simulation and Analysis of Random Fields},
    author = {Martin Schlather and Alexander Malinowski and Marco Oesting and Daphne Boecker and Kirstin Strokorb and Sebastian Engelke and Johannes Martini and Felix Ballani and Olga Moreva and Jonas Auel and Peter J Menck and Sebastian Gross and Ulrike Ober and Paulo Ribeiro and Brian D Ripley and Richard Singleton and Ben Pfaff and {R Core Team}},
    year = {2022},
    note = {R package version 3.3.14},
    url = {https://cran.r-project.org/package=RandomFields},
  }

  Martin Schlather, Alexander Malinowski, Peter J. Menck, Marco
  Oesting, Kirstin Strokorb (2015). Analysis, Simulation and Prediction
  of Multivariate Random Fields with Package RandomFields. Journal of
  Statistical Software, 63(8), 1-25. URL
  https://www.jstatsoft.org/v63/i08/.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Analysis, Simulation and Prediction of Multivariate Random Fields with Package {RandomFields}},
    author = {Martin Schlather and Alexander Malinowski and Peter J. Menck and Marco Oesting and Kirstin Strokorb},
    journal = {Journal of Statistical Software},
    year = {2015},
    volume = {63},
    number = {8},
    pages = {1--25},
    url = {https://www.jstatsoft.org/v63/i08/},
  }