1) Medicinenet.com. Levothyroxine Sodium. Feb 24, 2001. Online. Internet. 3/28/01. Available: http://www.stcloud.msus.edu/~lesikar/einstein/Einstein2.html.

2) Jones Pharma Incorporated. Levoxyl. Mar 6, 2001. Online. Internet. 3/28/01. Available: http://www.jmedpharma.com/html/levoxyl.html

3) The Thyroid Society. Hormone Replacement. 1996. Online. Internet. 4/12/01. Available: http://www.the-thyroid-society.org/replacement.html

4) RxList. Levothyroxine. 2001. Online. Internet. 4/15/01. Available: http://www.rxlist.com/cgi/generic/levothy_cp.htm

Book Sources:

1) The New Book of Popular Science, Deluxe Library Edition, Volume5. Thyroid Disorders. Grolier,Inc. Danbury,CT. 1998. pp249.

2) McGraw-Hill Concise Encyclopedia of Science and Technology, 4th Edition. Thyroxine. McGraw-Hill. New York, NY. 1998. pp1996-1997.

3) The Gale Encyclopedia of Medicine, Volume 3. Hypothyroidism. Gale Research. Detroit, IL. 1999. pp1555-1557.

4) MacMillan Encyclopedia of Chemistry, Volume 2. Hormones. Simon&Schuster Macmillan. New York, NY. 1997. pp489-490.

5) The Physicians Desk Reference. Levoxyl. PDR. 1996. pp 918-919.

6) The Merck Index, 12th Edition. Thyroxine. Merck&Co. NJ. 1996.