Călifar (Romanian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Călifar" in Romanian language version.

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1books.google.com

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archive.org

Boie, Friedrich (1822). Tagebuch gehalten auf einer Reise durch Norwegen im Jahre 1817 (în German). Schleswig: Königl Taubstummen - Institut. pp. 140, 351.
Jobling, James A (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. p. 377. ISBN 978-1-4081-2501-4.

books.google.com

Kear, Janet (2005). Ducks, Geese, and Swans. Oxford University Press. p. 420. ISBN 0-19-861008-4.

jboyd.net

Taxonomy in Flux [1] Boyd, John (2007). „Tadornini” (PDF). Accesat în 30 august 2016.