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Oziewicz, Marek (July 2010). "Representations of Eastern Europe in Philip Pullman's His Dark Materials, Jonathan Stroud's The Bartimaeus Trilogy, and J. K. Rowling's Harry Potter Series". International Research in Children's Literature. 3 (1): 1–14. doi:10.3366/ircl.2010.0002. ISSN1755-6198. S2CID143553813.
Oziewicz, Marek (July 2010). "Representations of Eastern Europe in Philip Pullman's His Dark Materials, Jonathan Stroud's The Bartimaeus Trilogy, and J. K. Rowling's Harry Potter Series". International Research in Children's Literature. 3 (1): 1–14. doi:10.3366/ircl.2010.0002. ISSN1755-6198. S2CID143553813.
Rowling, J. K. "Extra Stuff". J. K. Rowling Official Site. Archived from the original on 19 February 2008.
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Oziewicz, Marek (July 2010). "Representations of Eastern Europe in Philip Pullman's His Dark Materials, Jonathan Stroud's The Bartimaeus Trilogy, and J. K. Rowling's Harry Potter Series". International Research in Children's Literature. 3 (1): 1–14. doi:10.3366/ircl.2010.0002. ISSN1755-6198. S2CID143553813.