Ulrich Ruckriem at work

Chicago citation style
Ulrich Ruckriem at work. 1971?. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3AAAADCD_item_7921&repo=DPLA. (Accessed December 18, 2018.)
APA citation style
(1971?) Ulrich Ruckriem at work. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3AAAADCD_item_7921&repo=DPLA
MLA citation style
Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3AAAADCD_item_7921&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.