When citing cdlTools, please cite both the package and underlying data
sources used:

  USDA-NASS. (2024) National Agricultural Statistics Service Cropland
  Data Layer. https://nassgeodata.gmu.edu/CropScape/

A BibTeX entry for LaTeX users is

  @Manual{cdl-site,
    title = {National Agricultural Statistics Service Cropland Data Layer},
    author = {{USDA-NASS}},
    year = {2024},
    note = {R package version 1.3-4},
    url = {https://nassgeodata.gmu.edu/CropScape/},
  }

  Chen, L., Lisic, J., Stachelek, J. (2024). Tools to Download and Work
  with USDA Cropscape Data. R package version 0.14.
  https://cran.r-project.org/package=cdlTools

A BibTeX entry for LaTeX users is

  @Manual{cdlTools-package,
    title = {Tools to Download and Work with USDA Cropscape Data},
    author = {Jonathan Lisic and Lu Chen and Jemma Stachelek},
    year = {2024},
    note = {R package version 1.13},
    url = {https://cran.r-project.org/package=cdlTools},
  }