1- http://www.realepicurean.com/2007/04/uses-for-mint/
2- http://lifeinthehighlands.com/2009/03/04/they-only-come-but-once-a-year/
3- http://en.wikipedia.org/wiki/Peppermint
4- http://www.gardenguides.com/111674-types-mint-leaves.html#ixzz19S2O8Uf1
5- http://herbs.lovetoknow.com/Slideshow:Types_of_Mint
6- http://www.essentialoils.co.za/essential-oils/spearmint.htm