Microscopes and balopticons for educational institutions

Chicago citation style
Bausch & Lomb Optical Company. Microscopes and balopticons for educational institutions. [c1930]. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/007939249. (Accessed December 11, 2018.)
APA citation style
Bausch & Lomb Optical Company, ([c1930]) Microscopes and balopticons for educational institutions. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/007939249
MLA citation style
Bausch & Lomb Optical Company. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/007939249>.
Note: These citations are programmatically generated and may be incomplete.