Unidentified equipment 4, upper corner view

Chicago citation style
Unidentified equipment 4, upper corner view. circa 1937. Retrieved from the Digital Public Library of America, https://calisphere.org/item/d172893e-6647-4e9c-8658-53a55ac45b3a. (Accessed December 11, 2018.)
APA citation style
(circa 1937) Unidentified equipment 4, upper corner view. Retrieved from the Digital Public Library of America, https://calisphere.org/item/d172893e-6647-4e9c-8658-53a55ac45b3a
MLA citation style
Retrieved from the Digital Public Library of America <https://calisphere.org/item/d172893e-6647-4e9c-8658-53a55ac45b3a>.
Note: These citations are programmatically generated and may be incomplete.