@book{ BA44896131,
  author    = "Bayyūḍ, Ḥusayn",
  title     = "الرسائل السياسية في العصر العباسي الاول",
  publisher = "Manshūrāt Wizārat al-Thaqāfah",
  year      = "1996",
  series    = "احياء التراث العربي",
  number    = "100",
  URL       = "http://ci.nii.ac.jp/ncid/BA44896131"
}