To cite package ‘FactEff’ in publications use:

  Dash S, Mandal B, Kumar A (2025). _FactEff: Efficiencies of Block
  Designs for Factorial and Fractional Factorial Experiments_. R
  package version 1.0, <https://CRAN.R-project.org/package=FactEff>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {FactEff: Efficiencies of Block Designs for Factorial and Fractional
Factorial Experiments},
    author = {Sukanta Dash and Baidya Nath Mandal and Anil Kumar},
    year = {2025},
    note = {R package version 1.0},
    url = {https://CRAN.R-project.org/package=FactEff},
  }