Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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