@book{ BA85633166,
  author    = "Spector, Phil",
  title     = "Data manipulation with R",
  publisher = "Springer",
  year      = "2008",
  series    = "Use R! / series editors, Robert Gentleman, Kurt Hornik, Giovanni Parmigiani",
  number    = "",
  URL       = "http://ci.nii.ac.jp/ncid/BA85633166"
}