APA (7th ed.) Citation

Barraclough, G. (1973). An introduction to contemporary history. Penguin Books.

Chicago Style (17th ed.) Citation

Barraclough, Geoffrey. An Introduction to Contemporary History. Penguin Books, 1973.

MLA (9th ed.) Citation

Barraclough, Geoffrey. An Introduction to Contemporary History. Penguin Books, 1973.

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