There is a book with advice on citing government information by Debora Cheney. It is held at the Information Center on Level 3:
The complete guide to citing government information resources: a manual for social science & business research.
Call number: 808.066016 G234c 2002
Citing Government Resources (University of Nevada) MLA style.
Citing Government Documents: American Psychological Association (TRINITY COLLEGE LIBRARY – Hartford, Connecticut)
Citation Guide for Historical Legislative Materials
Library of Congress web site providing samples of historical legislative material citations according to several styles.