To cite package ‘medicare’ in publications use:

Gambrel R (2017). medicare: Tools for Obtaining and Cleaning Medicare Public Use Files. R package version 0.2.1, https://github.com/robertgambrel/medicare.

Corresponding BibTeX entry:

  @Manual{,
    title = {medicare: Tools for Obtaining and Cleaning Medicare Public
      Use Files},
    author = {Robert Gambrel},
    year = {2017},
    note = {R package version 0.2.1},
    url = {https://github.com/robertgambrel/medicare},
  }