APA (7th ed.) Citation

Penguin Books. (1956). The Penguin Story MCMXXXV MCMLVI. Penguin Books.

Chicago Style (17th ed.) Citation

Penguin Books. The Penguin Story MCMXXXV MCMLVI. Harmondsworth [u.a.]: Penguin Books, 1956.

MLA (8th ed.) Citation

Penguin Books. The Penguin Story MCMXXXV MCMLVI. Penguin Books, 1956.

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