This page explains the comma placement needed between a direct quote and its speaker dependent upon the location of the attributive tag. It includes examples of various tag locations.

This page explains how to puctuate a direct quotation that ends in a question mark or an explanation point. If the quote comes before the attributive tag, no comma is needed; if the attributive tag comes before the quote, a comma is...

This slideshow focuses on how to punctuate dialogue; it explains the rules for quotation mark and comma use in direct speech, when switching speakers, and when a single speaker speaks in multiple, continuous paragraphs. It provides...

Ten detailed comma rules are found on this page.