To cite package 'copBasic' in publications use:

  Asquith, W.H., 2024, copBasic---General Bivariate Copula Theory and
  Many Utility Functions. R package version 2.2.6, Texas Tech
  University, Lubbock, Texas.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {copBasic---General Bivariate Copula Theory and Many Utility Functions},
    author = {William H. Asquith},
    year = {2024},
    note = {R package version 2.2.6},
  }