The World’s Healthiest Foods. Kale . (ONRI NE) Available at: http://www.whfoods.com/genpage.php/genpage.php?tname=foodspice&dbid=38.
The World’s Healthiest Foods. Kale. [ONLINE] Available at: http://www.whfoods.com/genpage.php/genpage.php?tname=foodspice&dbid=38. [Accessed 15 June 2017].