To cite in publications use:

R. K. S. Hankin 2005. Recreational mathematics with R: introducing the 'magic' package R News 5(1)

Corresponding BibTeX entry:

  @Article{,
    title = {Recreational mathematics with R: introducing the 'magic'
      package.},
    author = {Robin K. S. Hankin},
    journal = {R News},
    year = {2005},
    month = {May},
    volume = {5},
    issue = {1},
  }