APA (7th ed.) Citation

Mencken, H. L. (1940). Happy days, 1880-1892. A.A. Knopf.

Chicago Style (17th ed.) Citation

Mencken, H. L. Happy Days, 1880-1892. New York: A.A. Knopf, 1940.

MLA (9th ed.) Citation

Mencken, H. L. Happy Days, 1880-1892. A.A. Knopf, 1940.

Warning: These citations may not always be 100% accurate.