To cite ARDL in publications use:

Natsiopoulos K, Tzeremes N (2021). ARDL: ARDL, ECM and Bounds-Test for Cointegration. R package version 0.1.1, https://CRAN.R-project.org/package=ARDL.

Corresponding BibTeX entry:

  @Manual{,
    title = {{ARDL}: ARDL, ECM and Bounds-Test for Cointegration},
    author = {Kleanthis Natsiopoulos and Nickolaos Tzeremes},
    year = {2021},
    note = {R package version 0.1.1},
    url = {https://CRAN.R-project.org/package=ARDL},
  }