To cite package ‘ctpm’ in publications use:

  Noonan MJ, Fleming CH (2021). _ctpm: Continuous-Time Phylogenetic
  Modeling_. R package version 1.0.0,,
  <https://github.com/noonanm/ctpm>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ctpm: Continuous-Time Phylogenetic Modeling},
    author = {Michael J. Noonan and Christen H. Fleming},
    year = {2021},
    note = {R package version 1.0.0,},
    url = {https://github.com/noonanm/ctpm},
  }