To cite package ‘Path2PPI’ in publications use:

  Philipp O (2016). _Path2PPI: Prediction of pathway-related
  protein-protein interaction networks_. R package version 1.35.0,
  <https://bioconductor.org/packages/Path2PPI>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {Path2PPI: Prediction of pathway-related protein-protein interaction
networks},
    author = {Oliver Philipp},
    year = {2016},
    note = {R package version 1.35.0},
    url = {https://bioconductor.org/packages/Path2PPI},
  }