To cite tarchetypes in publications use:

  William Michael Landau (2021). tarchetypes: Archetypes for Targets.
  https://docs.ropensci.org/tarchetypes/,
  https://github.com/ropensci/tarchetypes.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {tarchetypes: Archetypes for Targets},
    author = {William Michael Landau},
    year = {2021},
    note = {{https://docs.ropensci.org/tarchetypes/, https://github.com/ropensci/tarchetypes}},
  }