APA

USA, . (1931). Publications of the National Commission on Law Observance and Enforcement. Washington, DC: Gov. Print. Off.

Chicago

USA, . 1931. Publications of the National Commission on Law Observance and Enforcement. Washington, DC: Gov. Print. Off.

Harvard

USA, . (1931). Publications of the National Commission on Law Observance and Enforcement. Washington, DC: Gov. Print. Off.

MLA

USA, . Publications of the National Commission on Law Observance and Enforcement. Washington, DC: Gov. Print. Off. 1931.