Cita APA (7a ed.)

Ralph, J. R. (1993). Northern protest: Martin Luther King, Jr., Chicago, and the civil rights movement. Harvard University Press.

Cita Chicago Style (17a ed.)

Ralph, James R. Northern Protest: Martin Luther King, Jr., Chicago, and the Civil Rights Movement. Cambridge [etc.]: Harvard University Press, 1993.

Cita MLA (9a ed.)

Ralph, James R. Northern Protest: Martin Luther King, Jr., Chicago, and the Civil Rights Movement. Harvard University Press, 1993.