APA (7th ed.) Citation

Collingwood, R. G. (1940). An essay on metaphysics. Clarendon Press.

Chicago Style (17th ed.) Citation

Collingwood, Robin George. An Essay on Metaphysics. Oxford: Clarendon Press, 1940.

MLA (9th ed.) Citation

Collingwood, Robin George. An Essay on Metaphysics. Clarendon Press, 1940.