Boeing Model 40-B4 mail plane at Boeing factory, August 24, 1929

Chicago citation style
Unknown. Boeing Model 40-B4 mail plane at Boeing factory, August 24, 1929. 1929. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/imlsmohai/id/4322. (Accessed July 20, 2018.)
APA citation style
Unknown, (1929) Boeing Model 40-B4 mail plane at Boeing factory, August 24, 1929. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/imlsmohai/id/4322
MLA citation style
Unknown. Retrieved from the Digital Public Library of America <http://cdm16786.contentdm.oclc.org/cdm/ref/collection/imlsmohai/id/4322>.
Note: These citations are programmatically generated and may be incomplete.