Perpetual Calendar

Chicago citation style
Ortensio Toro, Italian, active 16th century. Perpetual Calendar. 1594. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Achndm_1963-9-317&repo=DPLA. (Accessed October 23, 2018.)
APA citation style
Ortensio Toro, Italian, active 16th century, (1594) Perpetual Calendar. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Achndm_1963-9-317&repo=DPLA
MLA citation style
Ortensio Toro, Italian, active 16th century. Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Achndm_1963-9-317&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.