To cite package ‘RTMB’ in publications use:

  Kristensen K (2024). _RTMB: 'R' Bindings for 'TMB'_. R package
  version 1.6, <https://github.com/kaskr/rtmb>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {RTMB: 'R' Bindings for 'TMB'},
    author = {Kasper Kristensen},
    year = {2024},
    note = {R package version 1.6},
    url = {https://github.com/kaskr/rtmb},
  }