APA (7th ed.) Citation
Garmonsway, G., & Simpson, J. (1965). <The> Penguin english dictionary. Penguin Books.
Chicago Style (17th ed.) Citation
Garmonsway, G.N, and J. Simpson. <The> Penguin English Dictionary. Harmondsworth: Penguin Books, 1965.
MLA (9th ed.) Citation
Garmonsway, G.N, and J. Simpson. <The> Penguin English Dictionary. Penguin Books, 1965.
Warning: These citations may not always be 100% accurate.