To cite package 'copBasic' in publications use:

Asquith W (2020). copBasic—General Bivariate Copula Theory and Many Utility Functions. R package version 2.1.5.

Corresponding BibTeX entry:

  @Manual{,
    title = {copBasic---General Bivariate Copula Theory and Many
      Utility Functions},
    author = {W.H. Asquith},
    year = {2020},
    note = {R package version 2.1.5},
  }