To cite the magic package in publications use:

Robin K. S. Hankin (2005). “Recreational mathematics with R: introducing the 'magic' package.” R News, 5(1), 48-51.

Corresponding BibTeX entry:

  @Article{,
    title = {Recreational mathematics with R: introducing the 'magic'
      package},
    author = {{Robin K. S. Hankin}},
    journal = {R News},
    year = {2005},
    volume = {5},
    number = {1},
    pages = {48-51},
  }