Killer whales, commonly referred to as the orcas, at the Pier 56 Aquarium, Seattle, Washington, April 2, 1976

Chicago citation style
Wallen, Don, Unidentified. Killer whales, commonly referred to as the orcas, at the Pier 56 Aquarium, Seattle, Washington, April 2, 1976. 1976. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/hupy/id/1056. (Accessed October 22, 2018.)
APA citation style
Wallen, Don, Unidentified, (1976) Killer whales, commonly referred to as the orcas, at the Pier 56 Aquarium, Seattle, Washington, April 2, 1976. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/hupy/id/1056
MLA citation style
Wallen, Don, Unidentified. Retrieved from the Digital Public Library of America <http://cdm16786.contentdm.oclc.org/cdm/ref/collection/hupy/id/1056>.
Note: These citations are programmatically generated and may be incomplete.