Cita APA (7a ed.)

Wedgwood, C. V. (1957). The Thirty Years War. Penguin.

Cita Chicago Style (17a ed.)

Wedgwood, C. V. The Thirty Years War. Harmondsworth: Penguin, 1957.

Cita MLA (9a ed.)

Wedgwood, C. V. The Thirty Years War. Penguin, 1957.