APA (7th ed.) Citation

Douglas, M. (1973). Natural symbols: Explorations in cosmology. Penguin Books.

Chicago Style (17th ed.) Citation

Douglas, Mary. Natural Symbols: Explorations in Cosmology. Harmondsworth: Penguin Books, 1973.

MLA (9th ed.) Citation

Douglas, Mary. Natural Symbols: Explorations in Cosmology. Penguin Books, 1973.

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