Stepping stones of progress are corpses. Boston, Feb 28, 1874

Chicago citation style
Stepping stones of progress are corpses. Boston, Feb 28, 1874. 1874-02-28. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/nv935h74g. (Accessed June 18, 2018.)
APA citation style
(1874-02-28) Stepping stones of progress are corpses. Boston, Feb 28, 1874. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/nv935h74g
MLA citation style
Retrieved from the Digital Public Library of America <http://ark.digitalcommonwealth.org/ark:/50959/nv935h74g>.
Note: These citations are programmatically generated and may be incomplete.