APA (7th ed.) Citation

Socialist Union. (1956). Twentieth century socialism: The economy of tomorrow. Penguin books publishers.

Chicago Style (17th ed.) Citation

Socialist Union. Twentieth Century Socialism: The Economy of Tomorrow. Penguin books publishers, 1956.

MLA (9th ed.) Citation

Socialist Union. Twentieth Century Socialism: The Economy of Tomorrow. Penguin books publishers, 1956.

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