APA (7th ed.) Citation

Allen, R. (2002). The Penguin concise English dictionary. Penguin Books.

Chicago Style (17th ed.) Citation

Allen, Robert. The Penguin Concise English Dictionary. London: Penguin Books, 2002.

MLA (8th ed.) Citation

Allen, Robert. The Penguin Concise English Dictionary. Penguin Books, 2002.

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