To cite package ‘codebook’ in publications use:

  Arslan, R. C. (2019). How to automatically document data with the
  codebook package to facilitate data re-use. Advances in Methods and
  Practices in Psychological Science, 2(2), 169–187.
  https://doi.org/10.1177/2515245919838783

A BibTeX entry for LaTeX users is

  @Article{,
    title = {How to automatically document data with the codebook package to facilitate data re-use.},
    author = {{Ruben C. Arslan}},
    journal = {Advances in Methods and Practices in Psychological Science},
    year = {2019},
    volume = {2},
    number = {2},
    pages = {169–187},
    doi = {10.1177/2515245919838783},
  }