Sketches of ducklings

Chicago citation style
McCloskey, Robert, 1914-2003. Sketches of ducklings. 1939-1940. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/gb19f586c. (Accessed July 18, 2018.)
APA citation style
McCloskey, Robert, 1914-2003, (1939-1940) Sketches of ducklings. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/gb19f586c
MLA citation style
McCloskey, Robert, 1914-2003. Retrieved from the Digital Public Library of America <http://ark.digitalcommonwealth.org/ark:/50959/gb19f586c>.
Note: These citations are programmatically generated and may be incomplete.