@book{ BC14814981,
  author    = "Helmold, ca.ca. 1177 and Laurent, J. M. and Wattenbach, W. and Heine, Alezander",
  title     = "Chronik der Slaven",
  publisher = "Phaidon",
  year      = "1990",
  edition   = "2. Aufl",
  series    = "Historiker des deutschen Altertums",
  number    = "",
  URL       = "https://ci.nii.ac.jp/ncid/BC14814981"
}