APA (7th ed.) Citation

(1960). Penguins progress 1935-1960: Published on the occasion of the silver jubilee of Penguin Books. Penguin.

Chicago Style (17th ed.) Citation

Penguins Progress 1935-1960: Published on the Occasion of the Silver Jubilee of Penguin Books. Harmondsworth: Penguin, 1960.

MLA (8th ed.) Citation

Penguins Progress 1935-1960: Published on the Occasion of the Silver Jubilee of Penguin Books. Penguin, 1960.

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