Lectures on the errors of refraction and their correction with glasses delivered at the New York Post-Graduate Medical School with illustrative cases from practice, both private and clinical

Chicago citation style
Valk, Francis. Lectures on the errors of refraction and their correction with glasses delivered at the New York Post-Graduate Medical School with illustrative cases from practice, both private and clinical. [c1892]. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/008423453. (Accessed December 13, 2018.)
APA citation style
Valk, Francis, ([c1892]) Lectures on the errors of refraction and their correction with glasses delivered at the New York Post-Graduate Medical School with illustrative cases from practice, both private and clinical. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/008423453
MLA citation style
Valk, Francis. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/008423453>.
Note: These citations are programmatically generated and may be incomplete.