To cite package 'rio' in publications use:

Chan C, Chan GC, Leeper TJ, Becker J (2021). rio: A Swiss-army knife for data file I/O. R package version 0.5.29.

Corresponding BibTeX entry:

  @Manual{,
    title = {rio: A Swiss-army knife for data file I/O},
    author = {Chung-hong Chan and Geoffrey CH Chan and Thomas J. Leeper
      and Jason Becker},
    year = {2021},
    note = {R package version 0.5.29},
  }