To cite package ‘xlsxjars’ in publications use:

Dragulescu AA (2015). xlsxjars: Package required POI jars for the xlsx package. R package version 0.8.0, https://github.com/colearendt/xlsxjars.

Corresponding BibTeX entry:

  @Manual{,
    title = {xlsxjars: Package required POI jars for the xlsx package},
    author = {Adrian A. Dragulescu},
    year = {2015},
    note = {R package version 0.8.0},
    url = {https://github.com/colearendt/xlsxjars},
  }