To cite package ‘base.rms’ in publications use:

Zhang J, Jin Z (2020). base.rms: Convert Regression Between Base Function and 'rms' Package. R package version 1.0, https://CRAN.R-project.org/package=base.rms.

Corresponding BibTeX entry:

  @Manual{,
    title = {base.rms: Convert Regression Between Base Function and
      'rms' Package},
    author = {Jing Zhang and Zhi Jin},
    year = {2020},
    note = {R package version 1.0},
    url = {https://CRAN.R-project.org/package=base.rms},
  }