Symmetry Magazine
Symmetry Magazine: Explain It in 60 Seconds: Charm Quark
Charm quarks, described in this article, are a type of quark that is basic to matter. A particle with a charm quark deteriorates quickly into a regular particle. A study of these quarks could reveal critical information about matter....
Lawrence Berkeley National Laboratory
Berkeley Lab: The Particle Adventure: Quarks
An introduction to the six different types of quarks: the up, down, charm, strange, top, and bottom quarks.
Other
Fermilab: Worldwide Discoveries That Led to the Standard Model
A thorough review of subatomic particles and the people that discovered them. Each particle has its own link for additional information.