Cita APA (7a ed.)

Asbury, H. (1940). Gem of the prairie: An informal history of the Chicago underworld. Knopf.

Cita Chicago Style (17a ed.)

Asbury, Herbert. Gem of the Prairie: An Informal History of the Chicago Underworld. New York [u.a.]: Knopf, 1940.

Cita MLA (9a ed.)

Asbury, Herbert. Gem of the Prairie: An Informal History of the Chicago Underworld. Knopf, 1940.