Guide to the Records of the United States Senate: Appendix E, Glossary of Legislative and Archival Terms. National Archives and Records Administration, 1989.
Available online at
http://www.nara.gov/nara/legislative/senate_guide/sgtoc.html. Based on Robert W. Coren, Mary Rephlo, David Kepley, and Charles South,
Guide to the Records of the United States Senate at the National Archives, 1789–1989: Bicentennial Edition (Doct. No. 100–42), (National Archives and Records Administration, 1989).