To cite package ‘qtl2pattern’ in publications use:

  Brian S Yandell (2023). _qtl2pattern: Pattern Support for 'qtl2'
  Package_. R package version 1.2.2,
  <https://github.com/byandell/qtl2pattern>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {qtl2pattern: Pattern Support for 'qtl2' Package},
    author = {{Brian S Yandell}},
    year = {2023},
    note = {R package version 1.2.2},
    url = {https://github.com/byandell/qtl2pattern},
  }