Cita APA (7a ed.)

Barraclough, G. (1977). An Introduction to Contemporary History. Penguin.

Cita Chicago Style (17a ed.)

Barraclough, Geoffrey. An Introduction to Contemporary History. Harmondsworth: Penguin, 1977.

Cita MLA (9a ed.)

Barraclough, Geoffrey. An Introduction to Contemporary History. Penguin, 1977.