To cite package 'TwoRegression' in publications use:

  Paul R. Hibbing (2018). TwoRegression: Develop and Apply
  Two-Regression Algorithms. URL
  https://github.com/paulhibbing/TwoRegression/.

A BibTeX entry for LaTeX users is

  @Misc{,
    title = {TwoRegression: Develop and Apply Two-Regression Algorithms},
    author = {Paul R. Hibbing},
    year = {2018},
    url = {https://github.com/paulhibbing/TwoRegression/},
  }