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Here are the links to the references in the letter:
National Institute of Health
National Institute of Allergy and Infectious Diseases; National Institutes of Health, Department of Health and Human Services (2001-07-20). "Workshop Summary: Scientific Evidence on Condom Effectiveness for Sexually Transmitted Disease (STD) Prevention" (PDF). Hyatt Dulles Airport, Herndon, Virginia. pp. 13–15. Retrieved 2010-09-22.
FDA
Birth Control Guide: http://www.fda.gov/ForConsumers/ByAudience/ForWomen/WomensHealthTopics/ucm117971.htm
"other studies"
^ Cayley, W.E. & Davis-Beaty, K. (2007). "Condom effectiveness in reducing heterosexual HIV transmission". In Weller, Susan C. Effectiveness of Condoms in Reducing Heterosexual Transmission of HIV (Review). John Wiley & Sons, Ltd..doi:10.1002/14651858.