Swallowtail butterfly perched on a leaf, Seattle, Washington, June 13, 1973

Chicago citation style
Wallen, Don, Unidentified. Swallowtail butterfly perched on a leaf, Seattle, Washington, June 13, 1973. 1973. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/hupy/id/1177. (Accessed October 16, 2018.)
APA citation style
Wallen, Don, Unidentified, (1973) Swallowtail butterfly perched on a leaf, Seattle, Washington, June 13, 1973. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/hupy/id/1177
MLA citation style
Wallen, Don, Unidentified. Retrieved from the Digital Public Library of America <http://cdm16786.contentdm.oclc.org/cdm/ref/collection/hupy/id/1177>.
Note: These citations are programmatically generated and may be incomplete.