Citazione Stile APA (7a Edizione)

HEADDRICK, D. R. (1981). The Tools of empire: Technology andEuropean imperialism in the nineteenth century. O.U.Pr.

Citazione stile Chigago Style (17a edizione)

HEADDRICK, Daniel R. The Tools of Empire: Technology AndEuropean Imperialism in the Nineteenth Century. New York: O.U.Pr, 1981.

Citatione MLA (9a ed.)

HEADDRICK, Daniel R. The Tools of Empire: Technology AndEuropean Imperialism in the Nineteenth Century. O.U.Pr, 1981.