APF Mark 1920 Handheld Electronic Calculator

Chicago citation style
APF Electronics. APF Mark 1920 Handheld Electronic Calculator. ca 1980. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_214353&repo=DPLA. (Accessed November 19, 2018.)
APA citation style
APF Electronics, (ca 1980) APF Mark 1920 Handheld Electronic Calculator. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_214353&repo=DPLA
MLA citation style
APF Electronics. Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_214353&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.