Handbook of the Birds of the World (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Handbook of the Birds of the World" in Polish language version.

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macaulaylibrary.org

The Internet Bird Collection + The Macaulay Library. [w:] Macaulay Library [on-line]. Cornell Lab of Ornithology. [dostęp 2021-03-18]. (ang.).
Kathi Borgmann: The Internet Bird Collection joins the Macaulay Library. [w:] Macaulay Library [on-line]. Cornell Lab of Ornithology, 2020-02-28. [dostęp 2021-03-18]. (ang.).