Chapman, F. M. (1921). The distribution of bird life in the Urubamba Valley of Peru: A report on the birds collected by the Yale University-National Geographic Society's expeditions. Government Printing Office.
Chicago-Zitierstil (17. Ausg.)Chapman, Frank M. The Distribution of Bird Life in the Urubamba Valley of Peru: A Report on the Birds Collected by the Yale University-National Geographic Society's Expeditions. Washington: Government Printing Office, 1921.
MLA-Zitierstil (9. Ausg.)Chapman, Frank M. The Distribution of Bird Life in the Urubamba Valley of Peru: A Report on the Birds Collected by the Yale University-National Geographic Society's Expeditions. Government Printing Office, 1921.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.