Cita APA (7th ed.)

Graham, H. D., & Gurr, R. R. (1969). Violence in America: Historical and comparative perspectives. Signet Books.

Cita Chicago (17th ed.)

Graham, Hugh Davis, i Red Robert Gurr. Violence in America: Historical and Comparative Perspectives. New York: Signet Books, 1969.

Cita MLA (9th ed.)

Graham, Hugh Davis, i Red Robert Gurr. Violence in America: Historical and Comparative Perspectives. Signet Books, 1969.