To cite package ‘wtmapi’ in publications use:

  Votta F (2021). _wtmapi: Access to Public Who Targets Me API_. R
  package version 0.0.0.9000, <https://github.com/favstats/wtmapi>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {wtmapi: Access to Public Who Targets Me API},
    author = {Fabio Votta},
    year = {2021},
    note = {R package version 0.0.0.9000},
    url = {https://github.com/favstats/wtmapi},
  }