To cite package ‘RCPA4’ in publications use:

Edwards B (2026). RCPA4: Data and Functions for "An R Companion to Political Analysis, Fourth Edition". R package version 1.0.0, https://CRAN.R-project.org/package=RCPA4.

Corresponding BibTeX entry:

  @Manual{,
    title = {RCPA4: Data and Functions for "An R Companion to Political
      Analysis, Fourth Edition"},
    author = {Barry C. Edwards},
    year = {2026},
    note = {R package version 1.0.0},
    url = {https://CRAN.R-project.org/package=RCPA4},
  }