<http://www.ars.usda.gov/is/AR/archive/jun00/soil0600.htm>.
Glenn, Linda MacDonald. "Ethical Issues in Genetic Engineering." ActionBioscience.org 2004 29 005 2006
<http://www.actionbioscience.org/biotech/glenn.html>.
Malkinson, Terrance. "Health Care Access and Emerging Medical Technologies: Policy Decisions Cannot Be Made Lightly." Today's Engineer Online 01 012 2001 29 005 2006
<http://www.todaysengineer.org/archives/te_archives/dec01/pp2.asp>.
"Phytoremediation." Wikipedia. 2006 Wikipedia. 29 May 2006 <http://en.wikipedia.org/wiki/Phytoremediation>.
Sullia, S. B.. "Biotechnology and Bioethics." Foundation for Biotechnology Awareness and Education 2005 29 005 2006
<http://www.fbae.org/Channels/Bioethics/biotechnology_and_bioethics.htm>.