R. C. Allen Model 3089 Adding Machine

Chicago citation style
Allen Calculators, Inc. R. C. Allen Model 3089 Adding Machine. ca 1940. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_690627&repo=DPLA. (Accessed November 15, 2018.)
APA citation style
Allen Calculators, Inc, (ca 1940) R. C. Allen Model 3089 Adding Machine. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_690627&repo=DPLA
MLA citation style
Allen Calculators, Inc. Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_690627&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.