Flight Identification of Raptors of Europe, North Africa and the Middle EastDick ForsmanEsaurito4,4Avvisami
National Geographic Backyard Guide to the Birds of North America, 2nd EditionJonathan AlderferEsaurito4,4Avvisami
American Birding Association Field Guide to Birds of PennsylvaniaGeorge L. ArmisteadEsaurito4,4Avvisami
Výpravy do ptačího světa. příručka pro mladé a začínající ornitologyDavid WellingtonEsaurito4,4Avvisami
