To cite package 'copBasic' in publications use:

Asquith, W.H.,2019, copBasic---General Bivariate Copula Theory and Many Utility Functions. R package version 2.1.2, Texas Tech University, Lubbock, Texas.

Corresponding BibTeX entry:

  @Manual{,
    title = {copBasic---General Bivariate Copula Theory and Many
      Utility Functions},
    author = {W.H. Asquith},
    year = {2019},
    note = {R package version 2.1.2},
  }