To cite package ‘urbnmapr’ in publications use:

Strochak S, Ueyama K, Williams A (2019). urbnmapr: State and county shapefiles in sf and tibble format. R package version 0.0.0.9002, https://github.com/urbaninstitute/urbnmapr.

Corresponding BibTeX entry:

  @Manual{,
    title = {urbnmapr: State and county shapefiles in sf and tibble
      format},
    author = {Sarah Strochak and Kyle Ueyama and Aaron Williams},
    year = {2019},
    note = {R package version 0.0.0.9002},
    url = {https://github.com/urbaninstitute/urbnmapr},
  }