To cite package ‘usaidplot’ in publications use:

  Patterson-Stein J (2017). “usaidplot: a ggplot2 wrapper for creating
  plots that align with USAID's branding standards.”

A BibTeX entry for LaTeX users is

  @Misc{,
    title = {usaidplot: a ggplot2 wrapper for creating plots that align with USAID's branding standards},
    author = {Jacob Patterson-Stein},
    year = {2017},
  }