Barraclough, G. (1978). An introduction to contemporary history. Penguin Books.
Cita Chicago Style (17a ed.)Barraclough, Geoffrey. An Introduction to Contemporary History. Harmondsworth [etc.]: Penguin Books, 1978.
Cita MLA (9a ed.)Barraclough, Geoffrey. An Introduction to Contemporary History. Penguin Books, 1978.
Precaución: Estas citas no son 100% exactas.