To cite package ‘hrbrthemes’ in publications use:

Rudis B (2020). hrbrthemes: Additional Themes, Theme Components and Utilities for 'ggplot2'. R package version 0.8.0, https://github.com/hrbrmstr/hrbrthemes.

Corresponding BibTeX entry:

  @Manual{,
    title = {hrbrthemes: Additional Themes, Theme Components and
      Utilities for 'ggplot2'},
    author = {Bob Rudis},
    year = {2020},
    note = {R package version 0.8.0},
    url = {https://github.com/hrbrmstr/hrbrthemes},
  }