APA (7th ed.) Citation

(1995). Urea: (October 1991). Hirzel.

Chicago Style (17th ed.) Citation

Urea: (October 1991). Stuttgart: Hirzel, 1995.

MLA (9th ed.) Citation

Urea: (October 1991). Hirzel, 1995.

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