To cite package ‘ply’ in publications use:

  Jouda Q (2026). _ply: Bitboard Chess Engine_. R package version
  0.1.0, <https://CRAN.R-project.org/package=ply>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ply: Bitboard Chess Engine},
    author = {Qusai Jouda},
    year = {2026},
    note = {R package version 0.1.0},
    url = {https://CRAN.R-project.org/package=ply},
  }