"A" model

Chicago citation style
"A" model. ca. 1950. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Achndm_1993-150-41&repo=DPLA. (Accessed November 14, 2018.)
APA citation style
(ca. 1950) "A" model. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Achndm_1993-150-41&repo=DPLA
MLA citation style
Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Achndm_1993-150-41&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.