Tham khảo Otto_II_của_Thánh_chế_La_Mã

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    • Canduci, Alexander (2010), Triumph & Tragedy: The Rise and Fall of Rome's Immortal Emperors, Pier 9, ISBN 978-1741965988
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    • Chisholm, Hugh biên tập (1911). “Otto II” . Encyclopædia Britannica (ấn bản 11). Cambridge University Press.