@book{ BA52278240,
  author    = "Worger, William H. and Clark, Nancy L. and Alpers, Edward A.",
  title     = "Africa and the West : a documentary history from slave trade to independence",
  publisher = "Oryx Press",
  year      = "2001",
  URL       = "https://ci.nii.ac.jp/ncid/BA52278240"
}