Stellar Clusters Lecture notes by Professor Barbara Ryden. http://www-astronomy.mps.ohio-state.edu/~ryden/ast162_4/notes17.html

Star Clusters General information on star clusters from SEDS. http://www.seds.org/messier/cluster.html

Lacaille and his catalog of clusters and nebulae A discussion of Lacaille's catalog, which is mainly of historical interest. Includes the catalog itself. http://bozo.lpl.arizona.edu/messier/xtra/history/lacaille.html

Can You Pay to Get a Star Named? The Straight Dope column on a star naming scheme. http://www.straightdope.com/classics/a3_385.html