@book{ BA73367225,
  author    = "Kerbo, Harold R.",
  title     = "Social stratification and inequality : class conflict in historical, comparative, and global perspective",
  publisher = "McGraw-Hill",
  year      = "2006",
  edition   = "6th ed",
  URL       = "https://ci.nii.ac.jp/ncid/BA73367225"
}