To cite SSN2 in publications use:

Dumelle M, Peterson E, Ver Hoef J, Pearse A, Isaak D (2023). SSN2: Spatial Modeling on Stream Networks in R. R package version 0.1.0.

Corresponding BibTeX entry:

  @Manual{,
    title = {{SSN2}: Spatial Modeling on Stream Networks in {R}},
    author = {Michael Dumelle and Erin Peterson and Jay M. {Ver Hoef}
      and Alan Pearse and Dan Isaak},
    year = {2023},
    note = {{R} package version 0.1.0},
  }