http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=187

Chemistry and pharmacology of acetylcholine.

http://nba.uth.tmc.edu/neuroscience/s1/chapter11.html

The Cholinergic System: open-access ebook chapter with animations and self-quiz.

http://neuromuscular.wustl.edu/mother/acetylcholine.htm

Cholinergic receptors.

http://www.dnalc.org/view/1150-Acetylcholine-and-the-Cholinergic-System.html

Video describing the cholinergic system.

http://www.dnalc.org/view/2035-Acetylcholine-and-Alzheimer-s-disease.html

Video describing the role of acetylcholine in Alzheimer’s disease.