Παραπομπή APA

Cornwell, R. (1969). World History in the Twentieth Century. Longman.

Παραπομπή Chicago Style

Cornwell, R.D. World History in the Twentieth Century. London: Longman, 1969.

Παραπομπή MLA

Cornwell, R.D. World History in the Twentieth Century. Longman, 1969.