APA (7th ed.) Citation

Laski, H. J. (1938). Liberty in the modern state. Penguin Books.

Chicago Style (17th ed.) Citation

Laski, Harold Joseph. Liberty in the Modern State. Middlesex: Penguin Books, 1938.

MLA (9th ed.) Citation

Laski, Harold Joseph. Liberty in the Modern State. Penguin Books, 1938.