Citazione Stile APA (7a Edizione)

Kelly, N., & Whittock, M. (1995). The twentieth century world (Fully updated and rev. ed.). Heinemann.

Citazione stile Chigago Style (17a edizione)

Kelly, Nigel, e Martyn Whittock. The Twentieth Century World. Fully updated and rev. ed. Oxford [u.a.]: Heinemann, 1995.

Citatione MLA (9a ed.)

Kelly, Nigel, e Martyn Whittock. The Twentieth Century World. Fully updated and rev. ed. Heinemann, 1995.