APA (7th ed.) Citation

Young, G. F. (1933). The Medici ([1st modern library ed.].). Modern Library.

Chicago Style (17th ed.) Citation

Young, G. F. The Medici. [1st modern library ed.]. New York: Modern Library, 1933.

MLA (9th ed.) Citation

Young, G. F. The Medici. [1st modern library ed.]. Modern Library, 1933.