Cita APA (7a ed.)

Langhorne, R. (1981). The collapse of the Concert of Europe: International politics, 1890-1914. Macmillan.

Cita Chicago Style (17a ed.)

Langhorne, Richard. The Collapse of the Concert of Europe: International Politics, 1890-1914. London: Macmillan, 1981.

Cita MLA (9a ed.)

Langhorne, Richard. The Collapse of the Concert of Europe: International Politics, 1890-1914. Macmillan, 1981.