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Thietmar of Merseburg,
Thietmari merseburgiensis episcopi chronicon, VIII, 5(4). Sergent,
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- Műhely. pp. 48–49. ISBN 963-04-2913-6.
Thietmar of Merseburg,
Thietmari merseburgiensis episcopi chronicon, 1018 Jan M Piskorski,
Pommern im
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- 1967, p. 93, ISBN 9780472061723
Thietmar of Merseburg,
Thietmari merseburgiensis episcopi chronicon, 1018 Bryce,
James (1871). "The
Emperors Henry II...