Citazione Stile APA (7a Edizione)

Ward, H. (1980). World powers in the Twentieth Century (1. publ., reprinted with anmendments.). British Broadcasting Corp.

Citazione stile Chigago Style (17a edizione)

Ward, Harriet. World Powers in the Twentieth Century. 1. publ., reprinted with anmendments. London: British Broadcasting Corp, 1980.

Citatione MLA (9a ed.)

Ward, Harriet. World Powers in the Twentieth Century. 1. publ., reprinted with anmendments. British Broadcasting Corp, 1980.