To cite the 'productivity' package in publications please use:

  Dakpo KH, Desjeux Y and Latruffe L (2018). productivity: Indices of
  Productivity and Profitability Using Data Envelopment Analysis (DEA).
  R package version 1.1.0, URL:
  https://CRAN.R-project.org/package=productivity/.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {productivity: Indices of Productivity and Profitability Using Data Envelopment Analysis (DEA)},
    author = {K Hervé Dakpo and Yann Desjeux and Laure Latruffe},
    year = {2018},
    note = {R package version 1.1.0},
    url = {https://CRAN.R-project.org/package=productivity/},
  }

See also ‘citation()’ for citing R.