Legislative materials are addressed in Rule 13 (beginning at page 135).
While most of this rule deals with citing sources from the U.S. Congress, look for subsections dealing with comparable state sources, including:
The rule governing debates only covers the federal Congressional Record and its predecessors. But debates held in the Washington House or Senate may be important.Refer to Rule 18, The Internet, Electronic Media, and Other Nonprint Resources, pp. 178-89.