Horses with cargo walking over a small bridge, possibly on the Olympic Peninsula, date unknown

Chicago citation style
Unknown. Horses with cargo walking over a small bridge, possibly on the Olympic Peninsula, date unknown. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/nps/id/621. (Accessed October 20, 2018.)
APA citation style
Unknown, Horses with cargo walking over a small bridge, possibly on the Olympic Peninsula, date unknown. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/nps/id/621
MLA citation style
Unknown. Retrieved from the Digital Public Library of America <http://cdm16786.contentdm.oclc.org/cdm/ref/collection/nps/id/621>.
Note: These citations are programmatically generated and may be incomplete.