Cita APA (7th ed.)

Roberts, J. M. (1967). Europe, 1880-1945. Longmans.

Cita Chicago (17th ed.)

Roberts, John Morris. Europe, 1880-1945. London: Longmans, 1967.

Cita MLA (9th ed.)

Roberts, John Morris. Europe, 1880-1945. Longmans, 1967.