To cite package ‘cpi’ in publications use:

  Watson DS, Wright MN (2011). “Testing conditional independence in
  supervised learning algorithms.” _Machine Learning_, *110*(8),
  2107-2129. doi:10.1007/s10994-021-06030-6
  <https://doi.org/10.1007/s10994-021-06030-6>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Testing conditional independence in supervised learning algorithms},
    author = {David S. Watson and Marvin N. Wright},
    journal = {Machine Learning},
    year = {2011},
    volume = {110},
    number = {8},
    pages = {2107--2129},
    doi = {10.1007/s10994-021-06030-6},
  }