Book of the States (annual), Council of State Governments. The first chapter focuses on constitutions and provides a narrative survey of current developments in state constitutional law, accompanied by tables on topics such as the length of each constitution, dates of adoption, and amendment procedures.
Fundamentals of Legal Research (West)
Reference Guides To The State Constitutions of The United States (1990-date series, Greenwood Press), covers more than 40 states and provides a summary of each state’s constitutional history as well as a detailed analysis of the constitution, judicial interpretations, and references to books, articles, and other commentary on the constitutions.
State Constitutional Law in a Nutshell (West)
Find articles published in law journals, including those dedicated to and related to the topic of constitutional law:
Also, search in-state law journals, for example:
To find articles, use periodical indexes or search full-text databases:
Other secondary sources to consider include bar journals, newspapers (legal and general), and blogs.