To cite oolong in publications use:

Chan C, Sältzer M (2020). “oolong: An R package for validating automated content analysis tools.” Journal of Open Source Software, 5(55), 2461. doi:10.21105/joss.02461, https://github.com/gesistsa/oolong.

Corresponding BibTeX entry:

  @Article{,
    title = {oolong: An R package for validating automated content
      analysis tools},
    journal = {Journal of Open Source Software},
    author = {Chung-hong Chan and Marius Sältzer},
    doi = {10.21105/joss.02461},
    url = {https://github.com/gesistsa/oolong},
    volume = {5},
    number = {55},
    pages = {2461},
    year = {2020},
  }