To cite package ‘mra’ in publications use:

  McDonald T (2018). _mra: Mark-Recapture Analysis_. R package version
  2.16.11, <https://CRAN.R-project.org/package=mra>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {mra: Mark-Recapture Analysis},
    author = {Trent McDonald},
    year = {2018},
    note = {R package version 2.16.11},
    url = {https://CRAN.R-project.org/package=mra},
  }