Twenty years ago, and now

Chicago citation style
Arthur, T. S. (Timothy Shay), 1809-1885. Twenty years ago, and now. 1860. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/007939700. (Accessed December 19, 2018.)
APA citation style
Arthur, T. S. (Timothy Shay), 1809-1885, (1860) Twenty years ago, and now. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/007939700
MLA citation style
Arthur, T. S. (Timothy Shay), 1809-1885. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/007939700>.
Note: These citations are programmatically generated and may be incomplete.