Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Propane:

"
  • Propane is used as a propellant for many household aerosol sprays, including shaving creams and air fresheners.
  • Propane is a promising feedstock for the production of propylene.[citation needed]
  • Liquified propane is used in the extraction of animal fats and vegetable oils.[1]