APA (7th ed.) Citation

Garmonsway, G. N., & Simpson, J. (1978). The Penguin English dictionary Penguin reference books.

Chicago Style (17th ed.) Citation

Garmonsway, George Norman, and Jacqueline Simpson. "The Penguin English Dictionary." Penguin Reference Books 1978.

MLA (8th ed.) Citation

Garmonsway, George Norman, and Jacqueline Simpson. "The Penguin English Dictionary." Penguin Reference Books, 1978.

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