To cite the gsl package in publications use:

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

Corresponding BibTeX entry:

  @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},
  }