1. The Oxford Companion to United States History
2. Some constitutional lawyers have focused on the procedural requirements of section 128. See for example: Patrick Keyzer (2nd edn, 2005) Constitutional Law, LexisNexis Australia;J Mcmillan;Saskatchewan Law Review,2003
3. In addition, constitutional lawyers have examined the relationship of section 128 to different modes of constitutional interpretation;A Twomey,2004