APA (7th ed.) Citation

Wyndham, J., Hopkins, A., & Potter, J. (1991). Web. Penguin Books.

Chicago Style (17th ed.) Citation

Wyndham, John, Andy Hopkins, and Joc Potter. Web. London: Penguin Books, 1991.

MLA (9th ed.) Citation

Wyndham, John, et al. Web. Penguin Books, 1991.

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