To cite package ‘monotonicity’ in publications use:

Köstlmeier S (2021). monotonicity: Test for Monotonicity in Expected Asset Returns, Sorted by Portfolios. R package version 1.3.1, https://github.com/skoestlmeier/monotonicity.

Corresponding BibTeX entry:

  @Manual{,
    title = {monotonicity: Test for Monotonicity in Expected Asset
      Returns, Sorted by Portfolios},
    author = {Siegfried Köstlmeier},
    year = {2021},
    note = {R package version 1.3.1},
    url = {https://github.com/skoestlmeier/monotonicity},
  }