http://ia331431.us.archive.org/1/items/EnglishIvyPodcast/ENGIVYFEB0809_64kb.mp3
http://edis.ifas.ufl.edu/MG358#TABLE_2 English Ivies to Know and Grow
R.W. Henley and R.J. Black
http://www.invasive.org/eastern/eppc/HEHE.html
Southeast Exotic Pest Plant Council Invasive Plant Manual
http://www.dcnr.state.pa.us/FORESTRY/invasivetutorial/English_Ivy.htm Plant Conservation Alliance, Alien Plant Working Group.
Invasive Notes web log English ivy (Hedera helix) posts
Invasive Species: Selling on the Front Lines
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