APA (7th ed.) Citation

Collingwood, R. G. (1946). The Idea of history. Oxford University Press.

Chicago Style (17th ed.) Citation

Collingwood, R. G. The Idea of History. London: Oxford University Press, 1946.

MLA (9th ed.) Citation

Collingwood, R. G. The Idea of History. Oxford University Press, 1946.