APA (7th ed.) Citation

Highfield, R. (2003). The science of Harry Potter: How magic really works. Penguin Books.

Chicago Style (17th ed.) Citation

Highfield, Roger. The Science of Harry Potter: How Magic Really Works. New York: Penguin Books, 2003.

MLA (9th ed.) Citation

Highfield, Roger. The Science of Harry Potter: How Magic Really Works. Penguin Books, 2003.

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