Mitchell, Alan, ed. (2013). "Lilies and related plants"(PDF). RHS Lily Group. pp. 78–79. Archived from the original(PDF) on 6 October 2014. Retrieved 2 October 2014.
Mitchell, Alan, ed. (2013). "Lilies and related plants"(PDF). RHS Lily Group. pp. 78–79. Archived from the original(PDF) on 6 October 2014. Retrieved 2 October 2014.