To cite synthACS in publications use:

  Alex Whitworth. (2022) synthACS: Spatial MicroSimulation Modeling
  with Synthetic American Community Survey Data. Journal of Statistical
  Software, Forthcoming 7(104), 1-30.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {{synthACS}: Spatial MicroSimulation Modeling with Synthetic American Community Survey Data},
    author = {Alex Whitworth},
    journal = {Journal of Statistical Software},
    year = {2022},
    volume = {104},
    number = {7},
    pages = {1--30},
    doi = {10.18637/jss.v104.i07},
  }