Nënllojet: Dallime mes rishikimesh

* {{Cite book|url=http://yalepress.yale.edu/yupbooks/book.asp?isbn=9780300175523|title=The Feathery Tribe: Robert Ridgway and the Modern Study of Birds|last=Lewis|first=Daniel|publisher=Yale University Press|year=2012|isbn=9780300175523|location=New Haven, CT|ref=harv}}

* {{Cite book|title=Principles of Systematic Zoology|last=Mayr, E.|authorlink=Ernst W. Mayr|last2=Ashlock, P. D.|publisher=McGraw-Hill Inc.|year=1991|isbn=0-07-041144-1|edition=2nd|location=New York}}