[1] R.S. Wurman , Information Anxiety: What To Do When Information Doesn’t Tell You What You Need To Know ( Doubleday, New York , 1990). ISBN 0 38 524394 4.
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[2] R.S. Wurman , Information Anxiety 2 (2000). ISBN 0 78 972410 3.
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[3] Found at: http://www.shef.ac.uk/%7Eis/research/imrg/uncerty.html
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[4] E. Tanner , Harvard Magazine (November-December 1991).