Otón I do Sacro Imperio Romano Xermánico: Diferenzas entre revisións
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* {{cita publicación periódica|last=Howorth |first=H. H. |title=The Spread of the Slaves. Part III. The Northern Serbs or Sorabians and the Obodriti |journal=The Journal of the Anthropological Institute of Great Britain and Ireland |volume=9 |year=1880 |pages=181–232| jstor = 2841974|authorlink=Henry Hoyle Howorth}}
* {{cita libro|last=Lasko |first=Peter |year=1995 |title=Ars Sacra: 800–1200 |pages=chapter 9 |nopp=y |publisher=Yale University Press |isbn=978-0-300-06048-5|authorlink=Peter Lasko}}
* {{cita libro|last=Menzel |first=Wolfgang |year=2011 |origyear=1st. pub. 1871 |title=The History of Germany: From the Earliest Period to the Present Time Vol. I |publisher=Bell & Daldy |url=https://www.questia.com/read/9218550/the-history-of-germany-from-the-earliest-period-to |isbn=978-1-178-77378-1|authorlink=Wolfgang Menzel
* {{cita libro|last=Reuter |first=Timothy |year=2000 |title=The New Cambridge Medieval History, Vol. III: c. 900–c. 1024 |publisher=Cambridge University Press |isbn=978-0-521-36447-8 |ref=none|authorlink=Timothy Reuter}}
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