Παραπομπή APA

Watt, D. (1967). History of the World in the Twentieth Century. Pan Books.

Παραπομπή Chicago Style

Watt, D.C. History of the World in the Twentieth Century. London: Pan Books, 1967.

Παραπομπή MLA

Watt, D.C. History of the World in the Twentieth Century. Pan Books, 1967.