فهرست پرندگان شب‌گرد (Persian Wikipedia)

Analysis of information sources in references of the Wikipedia article "فهرست پرندگان شب‌گرد" in Persian language version.

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archive.org

Dunn, Jon L.; Alderfer, Jonathan (2006). "Owls". In Levitt, Barbara (ed.). National Geographic Field Guide to the Birds of North America (fifth ed.). Washington D.C.: National Geographic Society. pp. 256–265. ISBN 978-0-7922-5314-3.