Swarth, H. S. (1910). Two new owls from Arizona: With description of the juvenal plumage of Strix occidentalis occidentalis (Xantus). The University press.
Chicago-Zitierstil (17. Ausg.)Swarth, Harry S. Two New Owls from Arizona: With Description of the Juvenal Plumage of Strix Occidentalis Occidentalis (Xantus). Berkeley: The University press, 1910.
MLA-Zitierstil (9. Ausg.)Swarth, Harry S. Two New Owls from Arizona: With Description of the Juvenal Plumage of Strix Occidentalis Occidentalis (Xantus). The University press, 1910.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.