Citazione Stile APA (7a Edizione)

Thornton, A. P. (1977). Imperialism in the twentieth century. University of Minnesota Press.

Citazione stile Chigago Style (17a edizione)

Thornton, A. P. Imperialism in the Twentieth Century. Minneapolis: University of Minnesota Press, 1977.

Citatione MLA (9a ed.)

Thornton, A. P. Imperialism in the Twentieth Century. University of Minnesota Press, 1977.