English Plus+
English Plus: Commas in Compound Sentences
This grammar tutorial provides rules for the comma to separate independent clauses in a compound sentence.
English Plus+
English Plus: Commas in Addresses
Site describes and identifies how and when to use the comma in letter writing. Examples provided.
SUNY Empire State College
Empire State College: Rules for Use of Commas
Five basic uses of the comma and some other common uses are discussed with an example and a tip after each rule.
English Plus+
English Plus: Comma Content Rules
Site lists links to a large group of rules for comma usage. Each description is thorough and provides a multitude of examples.
University of Ottawa (Canada)
University of Ottawa: The Comma
The University of Ottawa's Writing Center developed this site. The major sections of the site are "Comma Usage" and "Superfluous Commas." Right and wrong examples are included, along with links for definitions.