Cita APA (7a ed.)

Barraclough, G. (1967). An introduction to contemporary history. Penguin.

Cita Chicago Style (17a ed.)

Barraclough, Geoffrey. An Introduction to Contemporary History. Harmondsworth: Penguin, 1967.

Cita MLA (8a ed.)

Barraclough, Geoffrey. An Introduction to Contemporary History. Penguin, 1967.

Attenzione: Queste citazioni potrebbero non essere precise al 100%.