APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.