Rulers of the world

Chicago citation style
Crain, Maurice. Rulers of the world. [c1940]. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/000399704. (Accessed August 19, 2018.)
APA citation style
Crain, Maurice, ([c1940]) Rulers of the world. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/000399704
MLA citation style
Crain, Maurice. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/000399704>.
Note: These citations are programmatically generated and may be incomplete.