To cite package ‘ContourFunctions’ in publications use:

  Erickson C (2024). _ContourFunctions: Create Contour Plots from Data
  or a Function_. R package version 0.1.2,
  <https://CRAN.R-project.org/package=ContourFunctions>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ContourFunctions: Create Contour Plots from Data or a Function},
    author = {Collin Erickson},
    year = {2024},
    note = {R package version 0.1.2},
    url = {https://CRAN.R-project.org/package=ContourFunctions},
  }