دوک‌نشین استونی (۱۳۴۶-۱۲۱۹) (Persian Wikipedia)

Analysis of information sources in references of the Wikipedia article "دوک‌نشین استونی (۱۳۴۶-۱۲۱۹)" in Persian language version.

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2books.google.com

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archive.org

Monumenta Livoniae Antiquae. E. Frantzen. 1842. p. 36.

books.google.com

Knut, Helle (2003). The Cambridge History of Scandinavia: Prehistory to 1520. Cambridge University Press. p. 269. ISBN 0-521-47299-7.
King of Denmark, Valdemar; Svend Aakjær (1926). Kong Valdemars Jordebog (به دانمارکی). Jørgensen.