APA (7th ed.) Citation

Barraclough, G. (1990). An introduction to contemporary history. Penguin Books.

Chicago Style (17th ed.) Citation

Barraclough, Geoffrey. An Introduction to Contemporary History. London: Penguin Books, 1990.

MLA (9th ed.) Citation

Barraclough, Geoffrey. An Introduction to Contemporary History. Penguin Books, 1990.

Warning: These citations may not always be 100% accurate.