1. "Invasive Species" Jennifer McGrath 2004 (Gale Encyclopedia of Science)
2. "Invasive Species" Sue A. Thompson. Plant sciences, Vol.3, 2001
3. "Plant Pest is major Ozone source." Geographical July 2010: 15
4. "Introduced Species" Usha Vedagiri and Douglas Smith. Environmental Encyclopedia, Vol. 1, 2003.
5. "Pollution by Invasive Species" Cindy Clendenon and Elliot Richmond. Water: Science and Issues, Vol. 3, 2003.
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