APA (7th ed.) Citation

Allen, R. (2005). How to write better English. Penguin Books.

Chicago Style (17th ed.) Citation

Allen, Robert. How to Write Better English. London: Penguin Books, 2005.

MLA (8th ed.) Citation

Allen, Robert. How to Write Better English. Penguin Books, 2005.

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