To cite package ‘montagu’ in publications use:

  FitzJohn R, Hinsley W (2024). _montagu: Interface with 'montagu'_. R
  package version 0.6.1, <https://github.com/vimc/montagu-r>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {montagu: Interface with 'montagu'},
    author = {Rich FitzJohn and Wes Hinsley},
    year = {2024},
    note = {R package version 0.6.1},
    url = {https://github.com/vimc/montagu-r},
  }