To cite ezpickr in publications use:

Seo J, Choi S (2019). ezpickr: Easy Data Import Using GUI File Picker and Seamless Communication Between an Excel and R. R package version 2.0.0, https://CRAN.R-project.org/package=ezpickr.

Corresponding BibTeX entry:

  @Manual{,
    title = {ezpickr: Easy Data Import Using GUI File Picker and
      Seamless Communication Between an Excel and R},
    author = {JooYoung Seo and Soyoung Choi},
    year = {2019},
    note = {R package version 2.0.0},
    url = {https://CRAN.R-project.org/package=ezpickr},
  }