@book{ BA85521887,
  author    = "O'Daffer, Phares G. and Clemens, Stanley R. and Charles, Randall (Randall I.)",
  title     = "Pre-algebra",
  publisher = "Addison-Wesley",
  year      = "1987",
  edition   = "Teacher's ed.",
  URL       = "https://ci.nii.ac.jp/ncid/BA85521887"
}