To cite in publications use:

Robin K. S. Hankin (2015). “Numerical evaluation of the Gauss hypergeometric function with the 'hypergeo' package.” The R Journal, 7, 81–88.

Corresponding BibTeX entry:

  @Article{,
    title = {Numerical evaluation of the Gauss hypergeometric function
      with the `hypergeo` package},
    author = {{Robin K. S. Hankin}},
    journal = {The R Journal},
    year = {2015},
    volume = {7},
    issue = {2},
    pages = {81--88},
  }