APA (7th ed.) Citation

Simon, U. G. (2012). Why purity?: An introduction. How purity is made.

Chicago Style (17th ed.) Citation

Simon, Udo Gerald. "Why Purity?: An Introduction." How Purity Is Made 2012.

MLA (9th ed.) Citation

Simon, Udo Gerald. "Why Purity?: An Introduction." How Purity Is Made, 2012.

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