APA (7th ed.) Citation

Valerie Illingworth. (1991). Dictionary of Physics. Penguin Books.

Chicago Style (17th ed.) Citation

Valerie Illingworth. Dictionary of Physics. England: Penguin Books, 1991.

MLA (9th ed.) Citation

Valerie Illingworth. Dictionary of Physics. Penguin Books, 1991.

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