Cita APA (7th ed.)

Graham, H. D., & Gurr, T. R. (1969). The history of violence in America: Historical and comparative perspectives. F.A. Praeger.

Cita Chicago (17th ed.)

Graham, Hugh Davis, i Ted Robert Gurr. The History of Violence in America: Historical and Comparative Perspectives. New York: F.A. Praeger, 1969.

Cita MLA (9th ed.)

Graham, Hugh Davis, i Ted Robert Gurr. The History of Violence in America: Historical and Comparative Perspectives. F.A. Praeger, 1969.