To cite smbr in publications use:

  Chris Muir and Joe Thorley (2018) smbr: Analyses Using STAN. doi:
  https://doi.org/10.5281/zenodo.1162382.

A BibTeX entry for LaTeX users is

  @Misc{,
    author = {Chris Muir and Joe Thorley},
    year = {2018},
    title = {smbr: Analyses Using STAN},
    doi = {https://doi.org/10.5281/zenodo.1162382},
  }

Please also cite STAN.