To cite btergm in publications, use:

  Leifeld P, Cranmer SJ, Desmarais BA (2018). “Temporal Exponential
  Random Graph Models with btergm: Estimation and Bootstrap Confidence
  Intervals.” _Journal of Statistical Software_, *83*(6), 1-36.
  doi:10.18637/jss.v083.i06 <https://doi.org/10.18637/jss.v083.i06>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Temporal Exponential Random Graph Models with {btergm}: Estimation and Bootstrap Confidence Intervals},
    author = {Philip Leifeld and Skyler J. Cranmer and Bruce A. Desmarais},
    journal = {Journal of Statistical Software},
    year = {2018},
    volume = {83},
    number = {6},
    pages = {1--36},
    doi = {10.18637/jss.v083.i06},
  }