Latest hot-water treatment advice for nematode and basal rot control in daffodil bulbs, Horticultural Development Center, August 2013
“Hot Water Treatment of Daffodil Bulbs,” Tom Stettner, Midwest Region Newsletter, Fall 2009
Hot Water Treatment of Narcissus Bulbs, UK Ministry of Agriculture, Fisheries and Food, 1977
“How Ramsbottom gave New Life to the Narcissus,” Matthew Zandbergen; RHS Daffodil Yearbook