http://en.wikipedia.org/wiki/Amino_acid

http://www.answers.com/topic/amino-acid

http://www.biology.arizona.edu/biochemistry/problem_sets/aa/aa.html

http://www.bodybuilding.com/store/amino.html

http://www.newworldencyclopedia.org/entry/Amino_acid

http://www.bionewsonline.com/e/what_is_amino_acid.htm

http://www.vitamins-supplements.org/amino-acids/

http://www.biblelife.org/amino.htm

http://www.bodyandfitness.com/Information/Fitness/aminochart_b.htm

http://micro.magnet.fsu.edu/aminoacids/index.html