Elementary slide rule manual; a self-intructing text book for beginners

Chicago citation style
Ritow, Herman. Elementary slide rule manual; a self-intructing text book for beginners. [c1925]. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/007935310. (Accessed November 21, 2018.)
APA citation style
Ritow, Herman, ([c1925]) Elementary slide rule manual; a self-intructing text book for beginners. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/007935310
MLA citation style
Ritow, Herman. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/007935310>.
Note: These citations are programmatically generated and may be incomplete.