To cite rENA in publications use:

  Marquart, C. L., Swiecki, Z., Collier, W., Eagan, B., Woodward, R. &
  Shaffer, D. W. (2018). rENA: Epistemic Network Analysis (0.4.12).
  https://cran.rstudio.com/web/packages/rENA/

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {rENA: Epistemic Network Analysis},
    author = {{Marquart} and C. L. and {Swiecki} and {Z.} and {Collier} and {W.} and {Eagan} and {B.} and {Woodward} and {R.} and {Shaffer} and D. W.},
    version = {0.4.12},
  }