1230 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "1230" in English language version.

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1books.google.com

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books.google.com

Fine, John V. A. Jr. (1994) [1987]. The Late Medieval Balkans: A Critical Survey from the Late Twelfth Century to the Ottoman Conquest. Ann Arbor, Michigan: University of Michigan Press. p. 125. ISBN 0-472-08260-4.

doi.org

Peter Linehan (1999). "Chapter 21: Castile, Portugal and Navarre". In Abulafia, David (ed.). The New Cambridge Medieval History, Volume 5, c.1198–c.1300. Cambridge: Cambridge University Press. pp. 668–673. ISBN 978-1-13905573-4.