To cite stantargets in publications use:

  Landau, W. M., (2021). The stantargets R package: a workflow
  framework for efficient reproducible Stan-powered Bayesian data
  analysis pipelines. Journal of Open Source Software, 6(60), 3193,
  https://doi.org/10.21105/joss.03193

A BibTeX entry for LaTeX users is

  @Article{,
    title = {The stantargets {R} package: a workflow framework for efficient reproducible {S}tan-powered {B}ayesian data analysis pipelines},
    author = {William Michael Landau},
    journal = {Journal of Open Source Software},
    year = {2021},
    volume = {6},
    number = {60},
    pages = {3193},
    url = {https://doi.org/10.21105/joss.03193},
  }