The twittering of birds

Chicago citation style
Billema, R. The twittering of birds. [18--?]. Retrieved from the Digital Public Library of America, http://search.lib.virginia.edu/catalog/uva-lib:1143974. (Accessed July 22, 2018.)
APA citation style
Billema, R, ([18--?]) The twittering of birds. Retrieved from the Digital Public Library of America, http://search.lib.virginia.edu/catalog/uva-lib:1143974
MLA citation style
Billema, R. Retrieved from the Digital Public Library of America <http://search.lib.virginia.edu/catalog/uva-lib:1143974>.
Note: These citations are programmatically generated and may be incomplete.