To cite package 'VisCollin' in publications use:

  Michael Friendly (2023). VisCollin: Visualizing Collinearity
  Diagnostics. R package version 0.1.2. URL
  https://CRAN.R-project.org/package=VisCollin

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {{VisCollin}: Visualizing Collinearity Diagnostics},
    author = {Michael Friendly},
    year = {2023},
    note = {R package version 0.1.2},
    url = {https://CRAN.R-project.org/package=VisCollin},
  }

To refer to the theory on which this package is based, also cite:

  Friendly, M. & Kwan, E. (2009).  Where’s Waldo: Visualizing
  Collinearity Diagnostics, The American Statistician, 2009, 63(1),
  56–65.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Where’s Waldo: Visualizing Collinearity Diagnostics.},
    author = {Michael Friendly and Ernest Kwan},
    year = {2009},
    journal = {The American Statistician},
    volume = {63},
    number = {1},
    pages = {56–65},
  }