To cite in publications use:

  R. K. S. Hankin 2006. Special functions in R: introducing the gsl
  package.  R News 6(4)

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Special functions in R: introducing the gsl package},
    author = {Robin K. S. Hankin},
    journal = {R News},
    year = {2006},
    month = {October},
    volume = {6},
    issue = {4},
  }