Gavard Perspectograph or Diagraph

Chicago citation style
Gavard, Adrien. Gavard Perspectograph or Diagraph. 1850-1900. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_904631&repo=DPLA. (Accessed November 20, 2018.)
APA citation style
Gavard, Adrien, (1850-1900) Gavard Perspectograph or Diagraph. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_904631&repo=DPLA
MLA citation style
Gavard, Adrien. Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_904631&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.